We provide classification of elements and periodicity in properties practice exercises, instructions, and a learning material that allows learners to study outside of the classroom. We focus on classification of elements and periodicity in properties skills mastery so, below you will get all questions that are also asking in the competition exam beside that classroom.
List of classification of elements and periodicity in properties Questions
Question No | Questions | Class |
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1 | The last element in Newlands’ periodic table was: A . zinc B. barium c. cesium D. thorium |
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2 | In Mendeleev’s periodic table, gaps were left for the elements to be discovered later. Which of the following elements found a place in the periodic table later? A. Germanium B. Chlorine c. oxygen D. silicon |
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3 | Q5. (a) How does atomic radius vary in group in the periodic table? (6) Explain (i) Radius of cation is less than that of the atom. (ii) Radius of anion is more than that of the atom. (iii) In iso-electronic ion, the ionic radii decreases with increase in atomic number. |
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4 | Among the following groupings, which represents the collection of isoelectronic species? A ( cdot C O, N O^{+}, C N^{-}, C_{2}^{2} ) B. ( N_{2}, C_{2}^{2-}, C O, N O ) c. ( N O, C N, N_{2}, O_{2}^{-} ) D. ( N O^{+}, C_{2}^{2-}, O_{2}^{-}, C O ) |
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5 | Which of the following is a formula of methanides : ( (a) B e_{2} C(b) C a C_{2}(c) ) ( boldsymbol{M} boldsymbol{g}_{2} boldsymbol{C}_{3}(mathrm{d}) boldsymbol{A} boldsymbol{l}_{4} boldsymbol{C}_{3} ) A. Only ( a, d ) B. Only ( a, b ) c. only ( c, d ) D. only ( b, d ) |
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6 | The most reactive metal is: A. sodium B. magnesium c. potassium D. calcium |
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7 | If the two members of a Dobereiner triad are phosphorus and antimony, the third member of this triad is : A. arsenic B. sulphur c. iodine D. calcium |
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8 | Which amongst the following has largest size? A . ( A l ) B. ( A l^{3} ) c. ( C l ) D. ( C l^{-} ) |
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9 | When a Dobernier triad is considered, the sum of the atomic weights of the terminal elements ‘X’ and ‘Z’ is 162.5. The atomic weight of ‘Z’ is 50 units less than 5 times that of ( X ). Calculate the atomic weights of ( X, Y, ) and ( Z . ) Identify their positions in the present periodic table. |
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10 | The electronic configuration of silicon is and that of sulphur is A. silicon – 2, 8, 1; Sulphur – 2, 8, 6 B. Silicon – 2, 8, 4; Sulphur – 2, 8, 3 c. silicon – 2, 8, 2; sulphur – 2, 8, 6 D. silicon – 2, 8, 4; Sulphur – 2, 8, 6 |
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11 | Which of the following species have the same number of electrons in its outermost as well as penultimate shell? A ( cdot C l ) B. ( O^{2} ) c. ( N a^{+} ) D. ( M g^{2+} ) |
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12 | What type of oxide would aluminium form ? A. ( E O_{3} ) в. ( E_{3} O_{2} ) ( mathrm{c} cdot E_{2} mathrm{O}_{3} ) D. EO |
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13 | The correct option with respect to the Pauling electronegativity values of the elements is: This question has multiple correct options A. Ga <Ge B. ( S is ) D. B <C |
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14 | Identify the wrong statement for long form of periodic table. A. It reflects the sequence of filling the electrons in the order of energy levels ( mathrm{K}, mathrm{L}, mathrm{M}, mathrm{N} ) B. It helps to predict the stable valence states of the elements C. It reflects trends in physical and chemical properties of the elements D. It helps to predict the relative ionicity of the bond between any two elements |
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15 | Assertion: In the periodic table, the atomic radius increases from left to right. Reason: The number of protons is increasing from left to right. ( A ) Both Assertion and Reason are true and the Reason is the correct explanation of the Assertion. B. Both Assertion and Reason are true, but Reason is not the correct explanation of the Assertion. c. Assertion is true, but the Reason is false. D. Assertion is false, but the Reason is true E. Both assertion and reason is incorrect |
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16 | The alkaline earth metal which shows some properties similar to aluminium is: A. ( C a ) в. ( B e ) ( c cdot s r ) D. ( B a ) |
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17 | The most electronegative element is: A. nitrogen B. fluorine c. oxygen D. chlorine |
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18 | Of the given alkali metals, the one with the smallest size is: ( A cdot R b ) B. cs ( c cdot k ) D. Na |
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19 | From the elements of the following atomic numbers 9,12,16,20,38,47 and ( 56, ) identify the elements that belong to same group in periodic table: A .9,16,39 В. 12,20,47 c. 20,38,47 D. 12,20,56 |
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20 | 033. In the modern periodic table, the period indicates the value of (a) atomic number (b) mass number (C) principal quantum number (d) azimuthal quantum number? . obou |
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21 | The first ionization potential of ( N a ) is 5.1 ( e V ). The value of electron gain enthalpy of ( N a^{+} ) will be : A. ( -5.1 mathrm{eV} ) B. ( -10.2 mathrm{eV} ) ( mathbf{c} .+2.55 mathrm{eV} ) D. -2.55 eV |
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22 | ( x, y, z ) are 3 members of Doheriner Periods. Atomic masses of ( x ) y are ( 7 mathrm{u} ) & ( 23 mathrm{u} ). What should be the mass of z? How? |
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23 | Mendeleev arrange the elements in the increasing order of their atomic weight in his periodic table. If true enter 1 , else enter 0 . |
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24 | As we go down in the electro-chemical series of metals, the reactivity A. decreases and then increases B. increases and then decreases c. decreases D. increases |
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25 | Which of the following represent(s) the correct order of electron affinities? This question has multiple correct options ( A cdot F>C mid>B r>1 ) B. ( c<N<C I<F ) c. ( N<c<0<F ) ( D cdot c<operatorname{sic} P<N ) |
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26 | Recently discovered elements (August 2003 ) with atomic number 113 and 115 have valence electrons in: A . ( s ) -orbital B. ( p ) -orbital c. ( d ) -orbital D. ( f ) -orbital |
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27 | 10. Which element has smallest size? (a) B (b) N (c) Al (d) P 5 |
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28 | ( left(frac{m}{m}right) ) mand nth ith ution ( ^{M(s)+frac{1}{2} x_{1} rightarrow M^{+} X-(s)} ) ใermsseseous met geeous cati def tortereonmere nswer ‘spositien why |
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29 | True or False Potassium is the most reactive alkali metals. |
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30 | What are the limitations of Mendeleev periodic table: |
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31 | When a Dobereiner’s triad is considered, the sum of atomic weights of the terminal elements ( X ) and ( Z ) is 162.5. The atomic weight of ( Z ) is 50 units less than 5 times that of ( X ). Identify the periods of ( X, Y ) and ( Z ) respectively in the present periodic table. A. 3,4,5 в. 4,5,6 c. 2,3,4 D. 3,5,4 |
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32 | Equal lengths of magnesium ribbons are taken in two test-tubes ( X ) and ( Y ) Hydrochloric acid is added to test-tube ( X ) and acetic acid is added to test-tube ( boldsymbol{Y} ) In which test-tube, the reaction will be more vigorous ? Why? |
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33 | Mendeleev classified elements in: A. increasing order of atomic groups. B. seven periods and eight groups. C. seven periods and nine groups D. eight periods and seven groups |
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34 | Which one of the following elements show different oxidation states? A. Sodium B. Fluorine c. chlorine D. Potassium |
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35 | Why was the method of classification, suggested by Dobereiner, discarded? A. The weights were wrongly calculated B. Many elements were unknown at that time c. only three triads were formed from the elements known at that time D. None of the above |
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36 | The elements with atomic numbers 2,10,18,36,54 and 86 are all A. Light metals B. Halogens c. Rare earths D. Noble gases |
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37 | Which of the above is reactive non metal? ( mathbf{A} cdot mathbf{1} ) B. 2 ( c cdot 3 ) ( D ) |
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38 | The element having most stable oxidation state +2 is A. ( Q ) B. ( c cdot s ) D. T |
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39 | The valency of elements in group I A is: ( A cdot 0 ) B. ( c cdot 2 ) D. 3 |
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40 | The magnetic nature of elements depends on the presence of unpaired electrons. Identify the configuration of transition elements which shows highest magnetic momentum: ( mathbf{A} cdot 3 d^{7} 4 s^{2} ) B. ( 3 d^{5} 4 s^{1} ) c. ( 3 d^{8} 4 s^{2} ) D. ( 3 d^{2} 4 s^{2} ) |
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41 | The correct order of electron affinity of ( B, C, N, O ) is : A. ( O>C>N>B ) в. ( B>N>C>O ) c. ( O>C>B>N ) D. ( O>B>C>N ) |
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42 | Why is the ( boldsymbol{E}^{0} ) value of ( boldsymbol{M} boldsymbol{n}^{+3} / boldsymbol{M} boldsymbol{n}^{+2} ) couple much more positive than ( boldsymbol{C r}^{+mathbf{3}} / boldsymbol{C r}^{+mathbf{2}} ) A. Due to larger third ionisation enthalpy of Mn. B. Due larger third ionisation enthalpy of Cr. c. Due to smaller third ionisation enthalpy of Mn. D. Due to lesser hydration enthalpy of Cr. |
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43 | The given diagram represents | 11 |
44 | Which of the following relation is correct? ( mathbf{A} cdot I^{s t} ) IE of ( C>I^{s t} ) IE of ( B ) B ( cdot I^{s t} ) IE of ( CI I^{n d} ) IE of ( B ) D. Both (B) and (C) |
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45 | Effective nuclear charge ( left(Z^{*}right) ) can be calculated by using the formula: ( mathbf{A} cdot Z^{*}=Z-S ) B . ( Z^{*}=Z+S ) c. ( Z^{*}=S-Z ) D. ( Z=Z^{*}-S ) |
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46 | The last element of actinide series is : A. thorium B. cerium c. lawrencium D. Iutetium |
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47 | Which of the following is incorrectly matched? A . alkali metal ( rightarrow ) cesium B. alkali earth metal ( rightarrow ) barium c. chalcogens ( rightarrow ) silicon D. halogon ( rightarrow ) iodine |
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48 | Forces of attraction between particles in a pure substance are associated with physical properties. Additionally, specific trends are associated with a given group of elements. Of the following, which shows the greatest variation in physical properties for the given group of elements? A. Alkali metals B. Alkaline earth metals c. Halogens D. Noble gases |
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49 | Reducing nature in increases with increase in atomic number in alkali metals. A. period B. group c. both ( A ) and ( B ) D. none of these |
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50 | How would you react on this statement? Electronegativity of nitrogen (N) on Pauling scale is 3.0 in all the nitrogen compounds. |
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51 | Mendeleev corrected the atomic weight of : ( A cdot B e ) B. ( N ) ( c cdot O ) D. ( C l ) |
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52 | An inert gas with more than one orbit, has electrons in its outermost shell. ( A cdot O ) B. 2 ( c cdot 4 ) D. 8 |
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53 | What type of oxide would Ekaaluminium form? A. ( E O_{3} ) в. ( E_{3} O_{2} ) ( mathrm{c} cdot E_{2} mathrm{O}_{3} ) D. ( E O ) |
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54 | Which one of the following belongs to representative group of elements in the periodic table? A. Lanthanum B. Tungston c. Chromium D. Aluminium |
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55 | In general, the properties that decrease and increase down a group in the periodic table, respectively, are: A. electronegativity and electron gain enthalpy. B. electronegativity and atomic radius c. atomic radius and electronegativity D. electron gain enthalpy and electronegativity |
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56 | Which group of elements does not show diagonal relationship? A. ( L i, M g ) в. ( B e, A l ) ( mathbf{c} cdot B, S i ) D. ( C, P ) |
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57 | The columns of the periodic table are called groups. A . True B. False |
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58 | In a group, basic nature from top to bottom. A. increases B. decreases c. remains same D. none of these |
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59 | The element, with atomic number 118 will be A . Alkali B. Noble gas c. Lanthanide D. Transition element |
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60 | Among the following outermost configuration of metals which shows the highest oxidation state? A ( cdot 3 d^{3} 3 s^{2} ) B . ( 3 d^{5} 4 s^{1} ) ( mathbf{c} cdot 3 d^{5} mathbf{4} s^{2} ) D. ( 3 d^{4} 4 s^{2} ) |
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61 | Q. 13 Electronic configuration of four elements A, B, C, and D are given below A. 15° 2s 2p B. 1s 2s 2p C. 1s 2s 2p 3s D. 1s 2s 2p Which of the following is the correct order of increasing tendency to gain electron? (a) A <C<B<D (b) A <B<C<D (CD <B<C<A (d) D<A <B<C |
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62 | Which ion has the least value of theoritical magnetic moment? A ( cdot C r^{3} ) в. ( C o^{3} ) ( c cdot T i^{3} ) D. ( V^{3+} ) |
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63 | The elements which have taken the place of Eka aluminium is : A. Germanium B. Gallium c. silicon D. Aluminium |
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64 | The attempt for classifying elements by plotting the atomic masses of elements against the atomic volumes was made by: A. Dobereiner B. Newlands c. Lother Meyer D. Mendeleev |
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65 | Classification of periodic table based on atomic number is given by: A. Mendeleev’s B. Mosley c. Both A and B D. None of these |
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66 | An element having atomic number 50 Find its group number and period numbers. | 11 |
67 | Following statements regarding the periodic trends of chemical reactivity of alkali metals and the halogens are given.Which of these statements give the correct picture? A. In alkali metals, the reactivity increases but for halogens it decreases with increase in atomic number down the group. B. The reactivity decreases in the alkali metals but increases in the halogens with increase in atomic number down the group. C. In both the alkali metals and the halogen the chemical reactivity decreases with increase in atomic number down the group. D. Chemical reactivity increases with increase in atomic number down the group. |
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68 | Q29. Write the general electronic configuration of s-, p-, d-, and f-block elements? | 11 |
69 | Consider an atom with the electron configuration of ( 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} ) Which successive ionization energy will be significantly higher than the previous value? A. First ionization energy. B. Second ionization energy c. Third ionization energy. D. Fourth ionization energy |
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70 | The biggest atom is: A. radium B. francium c. caesium D. rhodium |
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71 | Which of the following properly explains why the atomic radius decreases going cross a period from left to right? A. As you cross the period from left to right, the number of electron orbital shells decreases as the number of protons remains constant B. As you cross the period from left to right, the number of protons decreases as the number of electron orbitals remains constant. C. As you cross the period from left to right, the number of electron orbital shells increases as the number of protons remains constant D. As you cross the period from left to right, the number of protons increases as the number of electron orbitals remains constant |
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72 | A newly discovered element ( X ) is placed in group ( I A ) of the periodic table since it forms : A. an oxide which is acidic B. a volatile chloride having a formula ( X C l ) c. an ionic chloride having the formula ( X C l ) D. an insoluble ( X S O_{4} ) |
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73 | In the periodic table as formulated by Mendeleev, which of the following constitute an anomalous pair of elements? ( mathbf{A} cdot H ) and ( H e ) B. ( B r ) and ( N e ) c. ( K ) and ( A r ) D. ( N a ) and ( B ) |
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74 | What were the limitations of Dobereiner’s classification? |
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75 | Which reaction is most spontaneous? A ( cdot G a^{3+}+2 e^{-} rightarrow G a^{+} ) B. ( I n^{3+}+2 e^{-} rightarrow I n^{+} ) ( mathbf{c} cdot T l^{3+}+2 e^{-} rightarrow T l^{+} ) D. cannot be predicted |
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76 | Atomic size of nickel, cobalt and iron is in order of : ( boldsymbol{F e}>boldsymbol{C o}>boldsymbol{N i} ) A. True B. False |
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77 | Consider the following changes: ( boldsymbol{A} rightarrow boldsymbol{A}^{+}+boldsymbol{e}^{-}: boldsymbol{E}_{1} ) and ( boldsymbol{A}^{+} rightarrow boldsymbol{A}^{2+}+ ) ( e^{-}: E_{2} ) The energy required to pull out the two electrons are ( E_{1} ) and ( E_{2} ) respectively. The correct relationship between two energies would be: A ( cdot E_{1}E_{2} ) D. ( E_{1} neq E_{2} ) |
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78 | The Newland’s law of octaves for the classification of elements was found to be applicable only up to the element A. potassium B. calcium c. cobalt D. phosphorous |
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79 | Without knowing the electronic configurations of the atoms of elements Mendeleev still could arrange the elements nearly close to the arrangements in the Modern periodic table. How can you appreciate this? | 11 |
80 | The element placed with cerium, in the table formed by Newlands’ was: A . actinium B. lanthanum c. lawrencium D. zirconium |
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81 | enthalpies and electron gain enthalpies of .44 Match the correct ionisation enthalpies and electron gain en the following elements. Elements AH, AH AH Most reactive non-metal A 419 3051 – 48 (1) Most reactive metal B. 1681 3374 -328 (ii) Least reactive element C 738 1451 – 40 (iv) Metal forming binary halide D. 2372 5251 +48 |
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82 | most Q. 21 The electronic configuration of the outer most shell electronegative elements is (a) 2s22p5 (b) 3s 3p5 (C) 45-4p (d) 5s25p5 |
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83 | Number of vertical columns in the modern periodic table are: A. 7 B. 8 c. 10 D. 18 |
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84 | The elements having more masses were placed before elements having lower masses in Mendleev’s periodic table. Guess the pair of elements (higher mass, lower mass) A. Cobalt, Nickel B. Vanadium, Chromium c. Tellurium, lodine D. All of the above |
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85 | The maximum number of valence electrons possible for atoms in the second period of the periodic table is : A .2 B. 8 c. 18 D. 32 |
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86 | The ( 4 f ) level is successively filled up in: A. alkali metalss B. rare gases c. lanthanides D. actinides |
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87 | The electronic configurations of three elements ( X, Y ) and ( Z ) are given below. Which of the following is correct? ( x: 2,8 ) ( Y: 2,8,7 ) ( Z: 2,8,2 ) A. ( x ) is a metal B. Y is a metal c. ( z ) is a non-metal D. Y is a non-metal and ( z ) is a metal |
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88 | Q. 31 Illustrate by taking examples of transition elements and non-transition elements that oxidation states of elements are largely based on electronic configuration. |
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89 | According to the law of triads: A. the properties of the middle element were in between those of the other two members. B. three elements arranged according to increasing weights have similar properties. C. the elements can be grouped in the groups of six elements. D. every third element resembles the first element in periodic table. |
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90 | With reference to periodic table, indicate: First transition element of the fourth period. |
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91 | Which of the following pair has electron deficient compounds? A. ( B_{2} H_{6}, ) AlCla в. ( C_{2} H_{6}, ) Аl( _{2} C l_{6} ) c. ( S F_{2}, C l_{2} O ) D. ( N a B H_{4}, I C l ) |
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92 | ( A l ) has lower ionization potential than that of ( M g ) because: A. ( A l ) atom is bigger than ( M g ) atom B. ( M g ) atom is bigger than ( A l ) atom c. all electrons in ( M g ) are paired, but those of ( A l ) are not D. all belongs to a higher group |
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93 | Which of the following statement is incorrect? A. The most electronegative element is fluorine B. Alkali metals generally have negative value of electron gain enthalpy C. The oxidation number of ( sin N a_{2} S_{4} O_{6} ) is greater than in the case of ( N a_{2} S_{2} O_{3} ) D. The electronegativity values for ( 2 p ) series elements is less than that for ( 3 p ) series elements on account of small size and high inter electronic repulsion |
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94 | The properties of were predicted by Mendeleev before their isolation. ( A cdot ) Co and ( N i ) B. I and Te c. ( mathrm{sc} ), Ga and ( mathrm{Ge} ) D. Cl, Ar and K |
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95 | Number of electrons in ( M ) shell of an element with atomic number 28 is A . 18 B. 16 ( c cdot 8 ) D. 2 |
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96 | Using the periodic table, predict the formulas of compounds which might be formed by the following pairs of elements: (a) silicon and bromine (b) aluminium and suplhur. |
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97 | Number of orbits present in argon is: ( A cdot 1 ) B. 2 ( c .3 ) D. 4 |
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98 | The decreasing order of electron affinity is: A. ( I>B r>C l>F ) B. ( B r>C l>F>l ) c. ( F>C l>B r>l ) ( mathrm{D} cdot C l>F>B r>l ) |
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99 | Which of the following is not a noble gas? A. Helium B. Neon c. Argon D. Hydrogen |
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100 | The non-metal with valency 1 in period 3 is : A. ( N a ) в. ( M g ) c. ( A l ) D. ( C l ) |
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101 | Q2. Show by a chemical reaction with water that Na O is a basic oxide and C1,0- is an acidic oxide. |
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102 | Which of the following elements is a metalloid? A. Lithium B. Beryllium c. Boron D. Carbon |
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103 | In the first two groups of periodic table, the group number represents the : A. valency B. atomic weight c. atomic number D. oxidising nature |
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104 | Atomic number of a few elements are given below: 10,20,7,14 Identify the period to which these elements belong? A. 2,4,2,3 B. 3, 2, 3, २. c. 2,2,3,3 D. 3, 3, 2, 2. |
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105 | Which of the following electronic configurations in the outermost shell is characteristic of alkali metals? A ( cdot(n-1) s^{2} p^{6} n s^{2} p^{1} ) B . ( (n-1) s^{2} p^{6} d^{10} n s^{1} ) C ( cdot(n-1) s^{2} p^{6} n s^{1} ) D ( cdot n s^{2} n p^{6}(n-1) d^{1} ) |
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106 | The electronic configuration is given as: ( 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{10} 4 s^{2} 4 p^{6} 4 d^{10} 5 s^{2} ) is for: A. ( f ) -block element B. ( d ) -block element c. ( p ) -block element D. ( s ) -block element |
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107 | Arrange the following elements in increasing order of their size. Be, Ca, Ba, Ra A. Be <Ca<Ba<Ra B. ( mathrm{Ca}<mathrm{Be}<mathrm{Ba}<mathrm{Ra} ) c. ( mathrm{Be}<mathrm{Ca}<mathrm{Ra}<mathrm{Ba} ) D. None of these |
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108 | Which of the following carbon atoms is most electronegative? ( stackrel{I I I}{C H_{3}}-C_{I H_{2}}^{I I}-C equiv C_{H}^{I} ) ( A ) B. I ( c ) D. All are equal electronegative |
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109 | An element has its electronic configuration as ( 2,8,2 . ) Now answer the following question: To which period does does this element belong? |
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110 | What are the demerits of Mendeleev’s periodic table with respect to the arrangement of elements in ascending order? (Any three) |
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111 | Aluminium does not react with water at room temperature but reacts with both dil. ( H C l ) and ( N a O H ) solutions. Verify these statements experimentally. Write your observations with chemical equations. From these observations, can we conclude that ( A l ) is a metalloid? |
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112 | The electronegativity of the elments ( mathrm{C}, mathrm{N}, mathrm{Si} ) and ( mathrm{P} ) increases in the order of ( mathrm{Si} ) ( P, C, N ) If true enter 1 , else enter 0 . A |
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113 | Fluorine is the most reactive among all the halogens, because of it’s: A. small size B. low dissociation energy of F-F bond c. large size D. high dissociation energy of F – F bond |
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114 | In chemistry lab class, your teacher asks you to find magnesium oxide, ( M g O, ) to use in the experiment. When you go to the stockroom, you realized there is no magnesium oxide available. Which of the following would be the most suitable replacement? A. Sodium oxide, ( N a_{2} O ) B. Calcium oxide, ( C a O ) c. carbon dioxide, ( C O_{2} ) D. silicon dioxide, ( S i O_{2} ) |
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115 | Isotopes could find a position in Mendeleev’s periodic table. A. True B. False |
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116 | Arrange the following set of atoms in the order of increasing atomic radius: ( boldsymbol{F}, boldsymbol{C l}, boldsymbol{C}, boldsymbol{O} ) A. ( F, C l, O, C ) в. ( C, O, F, C l ) c. ( O, C, F, C l ) D. ( F, O, C, C l ) |
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117 | Assertion Mendeleev’s periodic table have some demerits. Reason There was no place for all isotopes of the elements and some heavy elements were placed before lighter elements. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect |
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118 | Electronic configuration of element T is 2,8,7 What is the group number of T? A . 15 B. 16 ( c cdot 17 ) D. 18 |
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119 | Dobereiner classified elements into groups based on their properties. The number of elements in each group is |
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120 | In the periodic table, the element with atomic number 6 will be in: A. second period B. third period c. fourth period D. fifth period |
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121 | The correct order of decreasing polarity ¡s: ( mathbf{A} cdot H F>S O_{2}>H_{2} O>N H_{3} ) B ( cdot H F>H_{2} O>S O_{2}>N H_{3} ) ( mathbf{C} cdot H F>N H_{3}>S O_{2}>H_{2} O>H F ) D. none of the above |
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122 | Hydrogen resembles: A. alkali metals B. halogens C. both ( A ) and ( B ) D. none of the above |
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123 | Which scientist came up with the concept of a periodic table that included all of the known elements? A. Joseph Priestly B. Dmitri Mendeleev c. Antoine Lavoisier D. Albert Einstein |
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124 | The elements whose atomic weight was corrected by Mendeleev are A. Uranium. B. Indium c. Beryllium D. All of these |
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125 | In the periodic table, vertical columns of elements are called ( ldots . . ) and horizontal rows of elements are called A. Groups, periods B. Periods, groups c. Periods, periods D. Groups, groups |
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126 | What is the value (including the sign) of the electron gain enthalpy or electron affinity of ( N a^{+} ) ion in electron -volts? The first ionization potential for Na is ( 118 mathrm{k} ) cal/mole. |
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127 | An atom has electronic configuration ( 2,8,7 . ) To which of the following elements would it be chemically similar? (Atomic numbers are given in parentheses) A . N(7) B. F(9) c. ( P(15) ) D. ( operatorname{Ar}(18) ) |
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128 | The standard emf of a galvanic cell involving cell reaction with ( n=2 ) is found to be ( 0.295 mathrm{V} ) at ( 25 mathrm{C}^{circ} ). The equilibrium constant of the reaction would be (Given, ( boldsymbol{F}=mathbf{9 6 5 0 0} boldsymbol{C m o l}^{-1}, boldsymbol{R}= ) ( left.8.314 J K^{-1} m o l^{-1}right) ) A ( .2 .0 times 10^{11} ) B . ( 4 times 10^{12} ) ( c cdot 1 times 10^{2} ) D. ( 1 times 10^{10} ) |
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129 | Find the oxidation numbers to the underlined species in the following compounds or ions. A) ( N a underline{B} H_{4} ) B) ( boldsymbol{H}_{2} boldsymbol{P} boldsymbol{t} boldsymbol{C l}_{boldsymbol{6}} ) |
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130 | The element which cannot form a cation is: A . ( A l ) в. ( B ) c. ( C s ) D. ( B i ) |
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131 | 6. The pair of amphoteric hydrogen is: (a) Li(OH), Al(OH), (b) Be(OH),, Mg(OH)2 (c) B(OH)2, Be(OH), (d) Be(OH)2, Zn(OH)2 |
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132 | Q17. How would you explain the fact that the first ionization enthalpy of sodium is lower than that of magnesium but its second iorization enthalpy is higher than that of magnesium? |
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133 | The correct order of stability of ( boldsymbol{A l}^{+}, boldsymbol{A l}^{+2}, boldsymbol{A l}^{+mathbf{3}} mathbf{i s} ) A ( cdot A l^{+3}>A l^{+2}>A l^{+} ) B. ( A l^{+2}>A l^{+3}>A l^{+} ) c. ( A l^{+2}A l^{+} ) D. ( A l^{+3}>A l^{+}>A l^{+} ) |
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134 | If each orbital can hold a maximum of 3 electrons. The number of elements in ( 2^{n d} ) period of the periodic table (long form) will be: A . 27 B. 9 c. 18 D. 12 |
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135 | ( ln ) a triad of ( A, B, C ) elements if the atomic masses of ( A ) and ( C ) respectively are 100 and ( 200, ) then the atomic mass of ( B ) is: A . 300 в. 175 c. 125 D. 150 |
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136 | 6. In the isoelectronic species the ionic radii (Å) of N3-, 02- and F are respectively given by (a) 1.71, 1.40, 1.36 (b) 1.71, 1.36, 1.40 (c) 1.36, 1.40, 1.71 (d) 1.36, 1.71, 1.40 |
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137 | Write Newland’s Law of ‘Octaves’ for classification of elements. |
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138 | The ratio of magnetic moments of ( boldsymbol{F} boldsymbol{e}^{boldsymbol{3}+} ) ( & C o^{3+} ) is: B. ( sqrt{35}: sqrt{24} ) ( c cdot 7: 3 ) D. ( sqrt{24}: sqrt{15} ) |
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139 | The electronic configuration of neon is: ( mathbf{A} cdot 1 mathbf{s}^{2} 2 mathbf{s}^{2} 2 mathbf{p}^{6} ) B. ( 1 mathrm{s}^{2} ) ( c cdot 2 s^{2} ) D. ( 1 s^{2} 2 s^{2} 2 p^{2} ) |
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140 | Q.53 Write the drawbacks in Mendeleef’s periodic table that led to its modification. |
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141 | Which of the following elements doesn’t belong to group IIA or 2nd group? A . Be в. Мв ( c cdot L ) D. ca |
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142 | The following statements concern elements in the periodic table. Which of the following is true? A. For Group 15 elements, the stability of +5 oxidation state increases down the group B. Elements of Group 16 have lower ionization enthalpy values compared to those of Group 15 in the corresponding periods c. The Group 13 elements are all metals D. All the elements in Group 17 are gases |
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143 | Isotopes could find a position in Mendeleev’s periodic table. State whether the given statement is true or false. A. True B. False |
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144 | The number of atoms contained in a fcc unit cell of a monatomic substance is |
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145 | The atomic number of natural radioactive element is: A. greater than 82 B. lesser than 82 c. not defined D. at least 92 |
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146 | Which of the following group of elements belong to the representative group? A. ( L i, M g, N, Z n ) в. ( A g, A u, Z n ) c. ( N a, K, B e ) D. ( F e, C u, M n ) |
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147 | 1. The highest ionization energy is exhibited by (a) halogens (b) alkaline earth metals c) transition metals (d) noble gases |
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148 | For the data given, calculate the energy deficit in the formation ( B e C l_{2} ) (it is a stable molecule) I. ( boldsymbol{E}_{1} ) for ( boldsymbol{B e}=mathbf{8 9 9 k J} / boldsymbol{m o l} ) I. ( boldsymbol{E} ). for ( boldsymbol{B e}=mathbf{1 7 5 7 k J} / boldsymbol{m o l} ) I.A. for ( C l=-348 k J / ) mol |
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149 | Which gases were unknown at the time of Mendeleev? A. Oxygen B. Noble gases ( c cdot C O_{2} ) D. None of the above |
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150 | Fill in the blanks: Periods are [5,6,7] horizontal rows of elements in the periodic table and an element with three electron shells and two electrons in its valence shell belongs to period [6,3,1] and group [3,6,2] |
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151 | What is the electronic configuration for ( operatorname{an} F e(I I I) ) ion in its ground state? ( mathbf{A} cdot[A r] 3 d^{5} ) B . ( [A r] 3 d^{6} ) ( mathbf{c} cdot[A r] 4 s^{2} 3 d^{3} ) D ( cdot[A r] 4 s^{2} 3 d^{6} ) |
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152 | How did Mendeleev predict the existence of some yet to be discovered elements in his periodic table? A. Gaps B. Atomic number c. Mass number D. None of the above |
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153 | Choose the correct answer from the four alternatives given in the brackets: Number of periods in modern periodic table is (7,17,8,18) |
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154 | The second ionization energies among Li. Be. ( B ) and ( C ) s lowest for ( mathbf{A} cdot L i ) в. ( B e ) ( c . B ) D. ( C ) |
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155 | Can the following groups of elements be classified as Dobereiner’s triad: (a) ( mathrm{Na}, mathrm{Si}, mathrm{Cl} ) (b) Be, Mg, Ca Justify the answer in each case. [Atomic mass of ( boldsymbol{B e}-mathbf{9} ; boldsymbol{N} boldsymbol{a}- ) ( mathbf{2 3} ; boldsymbol{M} boldsymbol{g}-mathbf{2 4} ; boldsymbol{S} boldsymbol{i}-mathbf{2 8} ; boldsymbol{C l}-mathbf{3 5} ; boldsymbol{C} boldsymbol{a}- ) 40] |
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156 | Consider the above figure as Periodic Table. Then the element with a possible oxidation number of -2 is begin{tabular}{|c|c|c|c|c|c|} hline ( mathbf{z}_{mathbf{L i}} ) & & & & & ( mathbf{( D )} ) & ( mathbf{1 0} ) \ hline & ( mathbf{( A )} ) & & & & ( mathbf{( C )} ) & & \ hline ( mathbf{( B )} ) & ( mathbf{2 0} ) & & & & & \ hline end{tabular} ( mathbf{A} ) ( B ) a ( D ) |
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157 | Representative elements are A. Elements of s and p block B. Elements of s, p and f block C. Elements of ( s, p ) and d block D. Elements of s and d block |
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158 | toppr LoGın Q Type your question enthalpy ( left(text { in } mathrm{kJ} mathrm{mol}^{-1}right) ) of a few elements are given below: begin{tabular}{llll} Elements & ( boldsymbol{Delta} boldsymbol{H}_{1} ) & ( boldsymbol{Delta} boldsymbol{H}_{2} ) & ( boldsymbol{Delta}_{e g} mathbf{H} ) \ 1 & 520 & 7300 & -60 \ 11 & 419 & 3051 & -48 \ hline 111 & 1681 & 3374 & -328 \ hline ( mathrm{IV} ) & 1008 & 1846 & -295 \ ( mathrm{V} ) & 2372 & 5251 & +48 \ hline ( mathrm{V} ) & 738 & 1451 & -40 end{tabular} Which of the above elements is likely to be: (a) the least reactive element, (b) the most reactive metal, (c) the most reactive non-metal, (d) the least reactive non-metal, (e) the metal which can form a stable binary halide of the formula ( mathrm{M} mathrm{X}_{2} ) (X=halogen) and (f) the metal which can form a predominantly stable covalent halide of th ( cdot ) mula MX (X=halogen)? |
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159 | Write Newland’s Law of Octaves. Write the name of element having similar properties of the following. (a) Nitrogen (b) Lithium |
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160 | In hydrogen atom the energy difference between the states ( n=2 ) and ( n=3 ) is Ee ( V ). The ionisation potential of ( H ) atom is: A . ( 3.2 E ) в. ( 5.6 E ) ( c .7 .2 E ) D. ( 13.2 E ) |
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161 | Calculate the electronegativity of chlorine from bond energy of ( boldsymbol{C l}-boldsymbol{F} ) bond ( left(61 k c a l m o l^{-1}right) F- ) ( Fleft(38 k c a l m o l^{-1}right) ) and ( C l-C l ) bond ( left(58 k c a l m o l^{-1}right) ) and electronegativity of fluorine ( 4.0 e V ) A. 1.42 eV в. 1.89 eV c. 2.67 eV D. 3.22 eV |
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162 | The electron configuration of ( _{11} N a^{23} ) is A ( cdot 1 s^{2}, 2 s^{2}, 2 p^{5}, 3 s^{2} ) B . ( 1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{1} ) C ( cdot 1 s^{2}, 2 s^{2}, 2 p^{4}, 3 s^{1}, 3 p^{2} ) D. ( 1 s^{1}, 2 s^{1}, 2 P^{6}, 3 s^{2}, 3 p^{1} ) |
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163 | Describe the two merits of long form periodic table over the Mendeleev’s periodic? |
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164 | If ( (N, P, A s) ) was Dobereiner’s triads then what would be the absolute error in atomic mass of phosphorous as compared to the original mass? Atomic mass: Nitrogen ( =14 ) amu, Arsenic ( =mathbf{7 4 . 9} ) amu, Phosphorous ( =mathbf{3 1} ) amu A. 13.45 B. 12.45 c. 15.55 D. 16.55 |
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165 | Ba is A. more electronegative B. more electropostive C . less electropositive D. none of the above |
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166 | Which of the following reactions are possible? This question has multiple correct options ( mathbf{A} cdot 3 M g+2 A l^{3+} rightarrow 2 A l+3 M g^{2+} ) B ( cdot C l_{2}+2 I^{-} rightarrow I_{2}+2 C l^{-} ) ( mathbf{c} cdot K^{+}+N a rightarrow K+N a^{+} ) ( mathbf{D} cdot K+N rightarrow K^{-}+N^{+} ) |
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167 | How does number of (i) valence electrons (ii) valency; vary on moving from to right: (a) in the second period of a periodic table ? (b) in the third period of a periodic table ( ? ) |
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168 | Electronegativity across the period: A. increases B. decreases c. remains constant D. can’t be predicted |
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169 | How many elements were known at the time of Mendeleevs classification of elements? |
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170 | What is the apparent oxidation state of ( boldsymbol{K} ) element in the compound ( boldsymbol{K} boldsymbol{H} boldsymbol{C} boldsymbol{O}_{3} ? ) A ( .+1 ) B. +2 ( c cdot+3 ) D. +4 ( mathrm{E} cdot+5 ) |
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171 | The third ionization energy amongst ( boldsymbol{L} boldsymbol{i}, boldsymbol{B} e, boldsymbol{B} ) and ( boldsymbol{C} ) is lowest for A . ( L i ) в. ( B e ) ( c . B ) D. ( C ) |
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172 | The element with atomic number 16 belongs to which period? A .2 B. 3 ( c cdot 4 ) D. |
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173 | Q14. What is the significance of the terms – isolated gaseous atom and ground state while defining the ionization enthalpy and electron gain enthalpy? [Hint: Requirements for comparison purposes] macamus state are |
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174 | Assertion lonisation potential increases with increase in nuclear charge of the elements. Reason lonization energies increase moving from left to right across a period. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect |
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175 | In the electronic configuration, outermost orbit number is considered as its period number. A. True B. False |
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176 | Complete the following Table: Electronic Bo |
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177 | Mendeleev’s periodic law states that the properties of elements are a periodic function of their: A. reactivity of elements B. atomic size c. atomic mass D. electronic configuration |
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178 | Match column I with column II and select the correct answer using the codes given below: Column I ( quad ) Column (A) ( frac{14}{6} C ) and ( _{6}^{13} C ) (p) Different number of neutrons (B) 40 20 ( mathrm{Ca} ) and ( _{18}^{40} boldsymbol{A r} ) (q) Different number of protons and neutrons (C) ( boldsymbol{K}(mathbf{1} mathbf{9}) ) (r) Non-metal (D) Chlorine (17) (s) Metal ( A cdot A-(p) ; B-(q) ; C-(r) ; D-(s) ) B. ( A-(q) ; B-(p) ; C-(s) ; D-(r) ) c. ( A-(p) ; B-(q) ; C-(s) ; D-(r) ) ( D cdot A-(p) ; B-(s) ; C-(q) ; D-(r) ) |
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179 | Mendeleev arranged the known elements in a/an order of their atomic masses. A. increasing B. decreasing c. random D. none of the above |
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180 | The element with atomic number ( Z= ) 115 will be placed in : A ( cdot 7^{t h} ) period , 1 A group B. ( 8^{t h} ) period , IV A group C. ( 7^{t h} ) period ( , ) V A group D. ( 6^{t h} ) period , ( vee ) B group |
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181 | In periodic table, which period have most electronegative elements? A . B. 2 ( c cdot 3 ) D. 4 E. 5 |
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182 | Which element exhibits the greatest number of oxidation states in its compounds? A. ( C a ) в. ( V ) c. ( C u ) D. Na |
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183 | Q9. What does atomic radius and ionic radius really mean to you? | 11 |
184 | The second ionization enthalpy is ( ? ) A. smaller than the first ionization enthalpy. B. almost equal to the first ionization enthalpy. C. smaller than the third ionization enthalpy. D. equal to the second electron gain enthalpy. |
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185 | Assertion Atomic number of the element ununtrium is 113 Reason According to IUPAC systematic nomenclature, the numerical roots for 1,1 and 3 are un, un and tri respectively A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect |
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186 | Which of the following is correct order of increasing size? (a) Br”>52- > Cr > Nat > Mg2+ > Be2+ (b) Be2+ > Mg2+ > Nat > 82-> Ci* >Brid (c) s->cr > Br”> Na* > Mg2+ > Be 2+ (d) Na > Mg2+ > Be2+ > Br > 52->cr |
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187 | Modern periodic table contains vertical columns. A . 17 B. 19 c. 18 D. 20 |
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188 | Assertion The atomic radii of the elements of oxygen family are smaller than the atomic radii of corresponding elements of the nitrogen family. Reason The members of oxygen family are all more electronegative and thus have lower value of nuclear charge than those of the nitrogen family. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion C. Assertion is correct but Reason is incorrect D. Assertion is incorrect but Reason is correct |
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189 | In the electronic configuration, outermost orbit number is considered as: A. period B. group c. octet D. none of these |
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190 | The pair of amphoteric hydroxides is: A. ( A l(O H)_{3}, L i O H ) B. ( B e(O H)_{2}, M g(O H)_{2} ) c. ( B(O H)_{3}, B e(O H)_{2} ) D. ( B e(O H)_{2}, Z n(O H) ) |
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191 | The total number of groups in Modern Periodic table is A. 7 B. 17 c. 18 ( D ) |
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192 | Alkyl halides react with dialkyl copper reagents to give: A. Alkenyl Halide B. Alkanes c. Alkyl copper halides D. alkenes |
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193 | Which of the following is not a metalloid? A. Silicon B. Germanium c. Arsenic D. Beryllium |
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194 | Q20. Which of the following pairs of elements would have a move negative electron gain enthalpy? O O or F (ii) For CI. Bottle and liind period An era move from the atomic size |
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195 | ( boldsymbol{M}+mathbf{8} boldsymbol{C} boldsymbol{N}^{-}+mathbf{2} boldsymbol{H}_{2} boldsymbol{O}+boldsymbol{O}_{2} rightarrow ) ( mathbf{4}left[boldsymbol{M}(boldsymbol{C} boldsymbol{N})_{2}right]^{-}+mathbf{4} boldsymbol{O} boldsymbol{H}^{-} ) metal M is: A. cu в. ( mathrm{Hg} ) c. ( A g ) D. Au |
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196 | Which element of 2nd period forms most acidic oxide? A. Flourine B. Nitrogen c. Boron D. Carbon |
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197 | Which has the same electronic configuration as of inert gas? A ( cdot mathrm{Ag}^{3} ) B. ( mathrm{Cu}^{2} ) ( c cdot P b^{4} ) D. ( mathrm{Ti}^{4} ) |
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198 | The element whose II (I.P.) is less than its ( |(mid . P .) ) A. ( L ) B. Be c. не D. None |
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199 | Hydrargyrum is the latin name of: | 11 |
200 | In the long form of periodic table, the total number of period is: A. 5 B. 7 ( c cdot 8 ) D. |
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201 | The atomic numbers of elements ( A, B, C ) and ( D ) are ( Z-1, Z, Z+1 ) and ( Z+2, ) respectively. If ( ^{prime} B^{prime} ) is a noble gas, choose the correct answers from the following statements (1) ( ^{prime} A^{prime} ) has higher electron affinity (2) ‘ ( C^{prime} ) exists in +2 oxidation state (3) ‘ ( D^{prime} ) is an alkaline earth metal A ( cdot(1) ) and (2) B. (2) and (3) c. (1) and (3) D. (1),(2) and (3) |
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202 | The element placed with nickel in the table formed by Newlands was: A . iron B. cobalt c. chromium D. copper |
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203 | For ( _{24} C r, ) which of the following statements is/are correct?
This question has multiple correct options |
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204 | The oxidation states exhibited by Tin are: ( mathbf{A} cdot+2 ) and +4 B. +1 and +2 c. +3 and +4 D. +4 only |
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205 | Which of the following statement is incorrect? A. Reducing power in aqueous solution is maximum for lithium metal. B. Electron affinity order ( O^{+}>O>O^{-}>O^{2-} ) C. Order of oxidation number of oxygen ( O_{3}>K O_{2}> ) ( B a O_{2}>K_{2} O ) D. ( p H ) of aqueous solution ( L i C l>B e C l_{2}>M g C l_{2}> ) ( A l C l_{3} ) |
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206 | Assertion Electron affinity value of ( C l^{-} ) has negative value. Reason Electron affinity values of all uninegative ions are negative. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect |
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207 | An element with the electron configuration ( [boldsymbol{X} boldsymbol{e}] boldsymbol{4} boldsymbol{f}^{14} boldsymbol{5} boldsymbol{d}^{7} boldsymbol{6} boldsymbol{s}^{2} ) is: A. an alkaline earth element B. a transition element c. an inertgas D. a rare earth |
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208 | un tne basıs or Ivlenaeleevs rerıoaıc Table given below, answer the question that follow the table: Ref. image Besides gallium, which two other elements have since been discovered for which Mendeleev had left gaps in his Periodic Table? Using atomic masses of Li,NaLi,Na, find the average atomic mass of and compare it with the atomic mass of. State the conclusion drawn from this activity. |
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209 | Prussian blue has two types of iron with oxidation number as shown ( prod_{boldsymbol{F}}^{boldsymbol{I I I}}[stackrel{boldsymbol{I I}}{left.boldsymbol{F} boldsymbol{e}(boldsymbol{C} boldsymbol{N})_{boldsymbol{6}}right]}] ) net charge on Prussian blue is – ( x ). The value of ( x ) is |
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210 | Atomic radii of fluorine is 42 pm. Atomic radii of oxygen is : A. ( 42 mathrm{pm} ) B. 39 pm c. ( 41 mathrm{pm} ) D. ( 48 mathrm{pm} ) |
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211 | Among the following compounds, which one is not responsible for the depletion of ozone layer? A ( . C H_{4} ) н 2 СО в. ( C F C l_{3} ) c. ( N O ) D. ( C l_{2} ) |
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212 | Electron affinity of chlorine is ( -3.61 mathrm{eV} ) ( I P ) value of the same element is 12.967 eV. ( 3 times 10^{23} ) atoms of chlorine are converted to ( C l^{-} ) ions and the energy liberated is used to ionize chlorine atoms to ( C l^{+} ) ions. How many chlorine atoms could be ionized in the above process? A ( .5 .45 times 10^{21} ) В. ( 6.11 times 10^{18} ) c. ( 8.35 times 10^{22} ) D. ( 7.11 times 10^{28} ) |
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213 | Out of the elements with atomic numbers given below which one would be a halogen? A . 25 B. 35 c. 45 D. 55 |
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214 | Mendeleev predicted the existence of certain elements not known at that time and named two of them as Eka – silicon and Eka – Aluminium. Mention the group of these elements in |
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215 | Consecutive elements ( X, Y ) and ( Z ) are in Period 3 of the Periodic Table. Element ( Y ) has the highest first ionisation energy and the lowest melting point of these three elements. What are the identities of ( X, Y ) and ( Z ? ) |
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216 | What is the IUPAC symbol of Rutherfordium? A . Rt B. Ru c. Rf D. Rd |
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217 | has 6 valence electrons. A. Nitrogen B. Oxygen c. Chlorine D. Neon E. Beryllium |
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218 | The number of electrons having ( n+ ) ( s=2.5 ) in sulphide ion is: ( A cdot 3 ) B. 4 ( c cdot 6 ) D. 2 |
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219 | Which pair of elements of atomic numbers given below will have similar chemical properties? ( mathbf{A} cdot 13,22 ) в. 3,11 ( c cdot 4,24 ) D. 2,4 |
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220 | Number of elements in 6 th period are: A . 28 B. 26 ( c cdot 34 ) D. 32 |
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221 | The ( 100^{t h} ) element is named in honor of A. Einstein B. Bohr c. Fermi D. Curie |
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222 | The electronic configuration of the two outermost shells of an atom is ( 3 s^{2} 3 p^{6} 3 d^{5} 4 s^{2} . ) What is this atom? A. Manganese B. Phosphorus c. strontium D. Vanadium |
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223 | If the two members of a Dobereiner’s triad are chlorine and iodine, then the third member of this triad is : A. fluorine B. bromine c. sodium D. calcium |
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224 | Which of the following has the lowest ionization energy? A ( . L i ) в. ( N a ) c. ( K ) D. ( R b ) ह. ( C s ) |
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225 | The maximum number of electrons that L shell can accommodate are : A . 4 B. 8 c. 16 D. 32 |
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226 | With respect to oxygen maximum valency is shown by: A. Halogen family B. Oxygen family c. Nitrogen family D. Boron family |
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227 | The spectrum of helium is expected to be similar to that of : ( mathbf{A} cdot H ) в. ( B e ) ( mathbf{c} cdot L i^{+} ) D. Ne |
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228 | Statement: In Dobernier classification of elements, the atomic weight of the middle element is equal to the average of the extreme elements of a triad. State whether the given statement is true or false. A. True B. False |
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229 | The noble gases are nonreactive because: A. they react with sodium B. they have a full outer shell of electrons C. they have a half outer shell of neutrons D. they are too thin |
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230 | Assertion Boron can only form ( left[boldsymbol{B} boldsymbol{F}_{4}right]^{-}, ) whereas aluminum forms ( left[A l F_{6}right]^{3-} ) Reason The first member of a group of elements in the ( s- ) and ( p- ) blocks shows anomalous behavior A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect |
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231 | Dobereiner was the first person to illustrate the relationship between the of elements and their properties. A. atomic masses B. electron negativity c. molecular masses D. number of protons |
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232 | Third period of the periodic table contains the following number elements: ( A cdot 2 ) B. 18 ( c cdot 8 ) D. 32 |
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233 | The family of elements to which sodium belongs is : A. alkali metalss B. alkaline earth metals c. halogens D. inert gases |
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234 | What is the total number of valence electrons in the peroxydisulphate, ( S_{2} O_{8}^{2-}, ) ion ( ? ) A . 58 B. 60 ( c cdot 62 ) D. 64 |
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235 | What name is given to the elements belonging to the third period of Mendeleev’s periodic table? | 11 |
236 | Explain why to ionize ( M g ) to ( M g^{+2} ) it needs three times as much energy as to form ( M g^{2+} ) |
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237 | Which of the following contains same number of elements? A. 1st period and Ogroup B. 6th period and III B group c. 5th period and III B group D. 3rd period and VII A group |
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238 | Compare and contrast the arrangement of elements in Mendeleev’s periodic table and the Modern periodic table. |
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239 | The modern periodic table is ordered on the basis of: A. atomic mass B. atomic radius c. atomic charge D. atomic number |
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240 | Which is the correct symbol for manganese? A. в. ма ( c . ) мп D. Mg |
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241 | Which of the following has the highest electronegativity? A. ( C ) в. ( M g ) ( c cdot O ) D. ( S ) |
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242 | In Doberenier triads, the atomic weights of the elements in a triad are in increasing order. A. True B. False |
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243 | Which is the correct order of increasing energy of the listed orbitals in the atom of titanium? (At. no. ( Z=22) ) ( mathbf{A} cdot 3 s 3 p 3 d 4 s ) B. 3s 3p 4s 3d c. ( 3 s ) 4s ( 3 p 3 d ) D. ( 4 s 3 s 3 p 3 d ) |
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244 | Which of the following order is wrong? ( mathbf{A} cdot N H_{3}<P H_{3}<A s H_{3}: ) Acidic strength B . ( L i<B e<B<C: I E_{1} ) c. ( A l_{2} O_{3}<M g O<N a_{2} O<K_{2} O: ) Basic strength D ( cdot L i^{+}<N a^{+}<K^{+}<C s^{+}: ) Ionic character |
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245 | Group 18 of the periodic table is known by the name as: A . alkal B. alkaline c. halogen D. noble |
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246 | When the atom Li, Be, B and Na are arranged in order of increasing atomic radius, what is the correct order? ( A cdot B, B e, ) Li, ( N a ) B. Li, Be, B Na a c. Ве, Li, В, Na |
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247 | A molecule ( boldsymbol{H}-boldsymbol{X} ) will be ( 50 % ) ionic if electronegativity difference of ( boldsymbol{H} ) and ( boldsymbol{X} ) is: A . 1.2 ev B. ( 1.4 mathrm{eV} ) c. ( 1.5 mathrm{ev} ) D. 1.7 ev |
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248 | The law used by Newland to arrange elements is known as | 11 |
249 | Multiple Answer Question Which of the following position of elements have same number of valence electrons as that of element of atomic number 6? This question has multiple correct options A. Group 14 and period 3 B. Group 14 and period 4 C. Group 6 and period 4 D. Group 14 and period 6 |
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250 | The most negative oxidation state of an atom of group 15 (VA) element is equal to the number of electrons required to fill the valence shell of the neutral atom. If true enter 1 ,if false enter 0 |
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251 | Dobereiner grouped the elements into triads and Newland gave the: A. law of Octaves B. mass number c. atomic number D. valency |
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252 | State True or False. IUPAC representation of atomic number 108 is ( boldsymbol{U} boldsymbol{n} boldsymbol{o} ) A. True B. False |
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253 | State the electronic configuration for Neon ( [p=10, n=10] ) A. 2,6 в. 2, c. 2,9 D. 2, 8 |
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254 | Q9. What are representative elements? | 11 |
255 | B and Si resemble each other in their properties. If true enter 1 , else enter 0 |
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256 | The plot of ( sqrt{boldsymbol{v}} ) vs ( mathbf{Z}, ) where ( boldsymbol{v} ) is frequency and ( z ) is atomic number, is : A. a straight line B. an exponential curve c. a hyperbolic D. a curve with – ve slope |
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257 | The position of three elements ( A, B ) and ( mathrm{C} ) in the Periodic Table are shown below- Group 16 ( B ) ( begin{array}{ll}6 & text { Group17 } \ & \ & mathrm{A} \ & \ & \ & mathrm{C}end{array} ) (a) State whether A is a metal or non- metal. (b) State whether ( C ) is more reactive or less reactive than ( mathbf{A} ) (c) Will ( C ) be larger or smaller in size than B? (d) Which type of ion, cation or anion, will be formed by element A? |
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258 | If three elements ( X, Y, ) and ( Z ) form a Dobereiner’s triad and atomic weights of ( X ) and ( Z ) are 9 and 40 respectively then the atomic weight of the element ( Y ) is approximately: A . 24. B. 49 c. 34.5 D. 29 |
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259 | Which of the following would be different in a ground state and in excited state of neon atom? A. The number of neutrons B. The number of electrons c. The atomic weight D. The electronic configuration E. Everything would remain the same |
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260 | Atomic number of ( S c^{3+}(18 e) ) is |
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261 | Which of the following statement(s) is (are) true? This question has multiple correct options A ( cdot ) Ionisation energy ( alpha frac{1}{text { Screening effect }} ) B. The first ionization energies of Be and Mg are more than ionization energies of ( B ) and ( A I ) respectively. C. Atomic and ionic radii of Niobium and Tantalum are almost same. D. Metallic and covalent radii of potassium are ( 2.3 A^{circ} ) and ( 2.03 A^{circ} ) respectively. |
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262 | Atomic number 112 placed in: A. s- block B. d- block c. f- block D. p- block |
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263 | What is the atomic number of the element with symbol Uus? A . 117 B. 116 c. 115 D. 114 |
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264 | First transitional series is present in: A. third period B. fifth period c. fourth period D. sixth period |
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265 | An element with atomic number 21 is a/an: A. Halogen B. Representative element c. Transition element D. Alkali metal |
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266 | that of Li (lithium). Q32. Predict the formulas of the stable binary compounds that would be formed by the combination of the following pairs of elements: (a) Lithium and oxygen (b) Magnesium and nitrogen (c) Aluminium and iodine (d) Silicon and oxygen (e) Phosphorous and fluorine (0) Element 71 and fluorine. |
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267 | How many periods are there in the long form of the periodic table? A. 6 B. 7 ( c cdot 8 ) ( D ) |
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268 | The ionization energy of a hydrogen-like atom is 9 Rydberg. The radius of first orbit of this atom, as compared to the radius of first orbit of hydrogen atom, will be A. One-fourth B. Half c. One-third D. Three times |
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269 | Zero group was introduced by : A. Lother Meyer B. Mendeleev c. Ramsay D. Lockyer |
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270 | Two atoms of similar electronegativity would be expected to form a covalent compound if true enter 1 else 0 | 11 |
271 | Which of the following sets of elements has strongest tendency to form anions? A. ( A s, S e, B r ) в. ( P, S, C l ) c. ( N, O, F ) D. ( S b, T e, I ) |
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272 | Define: Atomic radius, lonic radius, lonisation Enthalpy, Electron Gain enthalpy, Electronegativity. | 11 |
273 | How many vertical columns are there in the modern periodic table and what are they called? |
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274 | The group of the element with electronic configurations: ( 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} ) is 2. If true enter 1 , else enter 0 . |
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275 | The resistance of ( 1 mathrm{N} ) solution of acetic acid is ( 250 Omega ) when measured in a cell having a cell constant of ( 1.15 mathrm{cm}^{-1} . ) The equivalent conduction (in oh ( m^{-1} c m^{2} e q u i v^{-1} ) ) of ( 1 N ) acetic acid is A . 2.3 B. 4.6 c. 9.2 D. 18.4 |
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276 | Give the number of periods and groups in Modern Periodic Table. | 11 |
277 | The atomicity of neon gas is : A . two B. one c. four D. three |
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278 | Select the correct order of electronegativity: A ( . F>C l>B r>I ) B. ( N>P>A s ) ( c . ) both (a) and (b) ( D S>O>S e ) |
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279 | The general name of the elements of 17th group are: A. hydrides B. halogens c. chacogens D. noble gases |
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280 | Mendeleev arranged the elements in increasing order of their atomic masses and according to their physical properties. A. True B. False |
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281 | If an element A is present in group I of the periodic table, the formula of its chloride should be: A ( cdot A_{2} C l ) в. ( A C l_{2} ) c. ( A C l ) D. ( A C l_{3} ) |
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282 | As we move from left to right in a period, which of the periodic properties decreases?
This question has multiple correct options |
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283 | The energy required to convert all atoms presents in ( 1.2 g ) magnesium to ( M g^{2+} ) ions if ( I E . ) and ( I E_{2} ) of magnesium are ( 120 mathrm{kJ} ) mol ( ^{-1} ) and ( 240 mathrm{kJ} ) mol( ^{-1} ) respectively: A. ( 18 mathrm{kJ} ) J в. 36 к c. 360 k. D. 24 kJ |
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284 | Increasing order of density: ( N a<A l< ) ( boldsymbol{F} boldsymbol{e}<boldsymbol{P} boldsymbol{b} ) if true enter 1 , else enter 0 . ( A cdot 1 ) |
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285 | Which of the following pair of atomic numbers represents s-block elements? A .7,15 B. 6,12 ( mathrm{c} .9,17 ) D. 3,12 |
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286 | Which of the following element belongs to the halogen group? This question has multiple correct options A ( cdot 1 s^{2}, 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{5} ) B . ( 1 s^{2}, 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6}, 4 s^{2} ) C ( cdot[A r] 3 d^{10}, 4 s^{2} 4 p^{5} ) D . ( [K r] 4 d^{10}, 5 s^{2} 5 p^{5} ) |
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287 | An element ( M ) has an atomic number 9 and atomic mass ( 19 . ) Its negative ion will be represented by: ( mathbf{A} cdot M ) В. ( M^{2} ) ( c cdot M^{-} ) D. ( M^{2} ) |
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288 | System indicated in parentheses by Roman numerals. to name compounds is called as: A . periodic table B. stock nomenclature c. roman nomenclature D. all of the above |
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289 | Which of the following configurations has the highest ionization energy? A ( cdot 1 s^{2} 2 s^{2} 2 p^{1} ) B ( cdot 1 s^{2} 2 s^{2} 2 p^{3} ) C ( cdot 1 s^{2} 2 s^{2} 2 p^{2} ) D. ( 1 s^{2} 2 s^{2} 2 p^{4} ) |
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290 | The elements ( (z=117 text { and } 120) ) have not yet been discovered in which family or group would you place these elements and also give electronic configuration in each case? |
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291 | The electronic configuration of the element with maximum electron affinity is : A ( cdot 1 s^{2}, 2 s^{2} 2 p^{3} ) B . ( 1 s^{2}, 2 s^{2} 2 p^{5} ) C. ( 1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{5} ) D. ( 1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{3} ) |
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292 | The number of water molecules in hydrated beryllium salt never exceeds: A. 6 B. 3 ( c cdot 2 ) ( D ) |
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293 | Alkali and alkaline earth metals are elements. A. same B. different c. both A and B D. none of these |
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294 | The ( I_{1}, I_{2}, I_{3}, I_{4} ) values of an element ( M ) are ( 120 mathrm{kJ} / mathrm{mole}, 600 mathrm{kJ} / mathrm{mole}, 1000 ) kJ/mole and ( 8000 mathrm{kJ} / ) mole. Then the formula of its sulphate is: A. ( M S O_{4} ) в. ( M_{2}left(S O_{4}right)_{3} ) ( mathrm{c} cdot M_{2} mathrm{SO}_{4} ) D. ( M_{3}left(S O_{4}right)_{2} ) |
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295 | 08. What are Dobereiner’s triads? Name two such triads. | 11 |
296 | If electronegativity values of element ( boldsymbol{X} ) and ( Y ) are 3.8 and 1.8 respectively, then an ionic percentage of compound ( boldsymbol{X} boldsymbol{Y} ) is: A . 50 B. 46 ( c cdot 64 ) D. 36 |
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297 | Eka-aluminium forms oxide of the type : ( A cdot E_{2} O ) B. ( E O ) ( mathrm{c} cdot E_{2} mathrm{O}_{3} ) D. ( E_{3} O_{4} ) |
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298 | Which one of ( mathrm{K}, mathrm{I}, mathrm{Cl} ) and ( mathrm{Li} ) Will display the highest first ionisation energy? ( A cdot K ) B. c. ( c ) D. L |
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299 | Identify the property which does not reflect the periodicity of the elements. A. Bonding behaviour B. Electronegativity c. lonization potential D. Neutron-proton ratio |
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300 | The electronic configuration of calcium is ( 2,8,8,2 . ) Find the valency of the element? A . 1 B . 2 ( c .3 ) D. |
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301 | Q8. Which has a larger radius? (i) Mg or Ca (ii) S or Cl |
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302 | Electronic configuration of Mg is: ( mathbf{A} cdot 1 s^{2} 2 s^{1} p^{5} 3 s^{2} 3 d^{2} ) B. ( 1 s^{2} 2 s^{2} p^{6} 3 s^{2} ) C ( cdot 1 s^{2} 2 s^{2} p^{7} 3 s^{1} ) D. ( 1 s^{2} 2 s^{2} p^{6} 3 s^{2} p^{2} ) |
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303 | Recently discovered element with atomic number 115 is: A. Uun в. ( U u b ) c. ( U u p ) D. Uus |
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304 | Two metals ( M ) and ( N ) have the following values of ionization energies. Find energy required for formation of ( boldsymbol{M}^{+} ) from ( M, M^{+2} ) from ( M^{+}, ) and total energy required to form ( M^{+2} ) from ( M ) Do similar calculations for metal ( N ) ( I E_{1} quad I E_{2} ) [ 496 quad 4560 ] 738 1450 |
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305 | Q35. Anything that influences the valence electrons will affect the chemistry of the element. Which one of the following factors does not affect the valence shell? (a) Valence principal quantum number (n) (b) Nuclear charge (Z) (c) Nuclear mass (d) Number of core electrons. |
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306 | Q.54 In what manner is the long from of periodic table better than Mendeleef’s periodic table? Explain with examples. |
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307 | Which has the lowest anion to cation size ratio? A . ( L i F ) В. ( N a F ) c. ( C s I ) D. ( C s F ) |
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308 | Which of the following options are incorrect? A. Decreasing ( I . E_{2}: F>N>0 ) B. Increasing atomic size : Be < B < Li < Na a c. Metallic bond strength: Na < Zn < Ca D. Increasing electron affinity : ( O^{2-}<O^{-}<O^{+}<O ) |
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309 | Which periods were not divided into two series in the Mendeleev’s periodic table? A .4 B. 5 ( c .6 ) D. None of the above |
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310 | Q. 21 Which of the following have no unit? (a) Electronegativity (b) Electron gain enthalpy (c) lonisation enthalpy (d) Metallic character |
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311 | A particular atom has the 4 th shell as its valence shell. If the difference between the number of electrons between K and N shell and L and M shell is zero, find the electronic configuration of its stable ion. A. 2,8,8,2 B. 2, 8, 18,8 c. 2,8,8 D. 2, 8 |
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312 | The formulae of chloride of metal ( M ) is ( M C l_{2} . ) The metal ( M ) belongs to group. |
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313 | 3. Which of the following is arranged in order of increasing radius? (a) K (aq) < Na+ (aq) (c) K+ (aq) > Li* (aq) > Na (aq) (d) Lit (aq) < Nat (aq) <K+ (aq) a) Lit can nama |
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314 | Dobereiner was able to identify triads from the elements known at that time. |
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315 | A quantity of 15.8 g of ( K M n O_{4} ) can be decolourized in acidic medium by ( (mathrm{K}= ) ( 39, M n=55, F e=56 ) This question has multiple correct options A . ( 18.25 mathrm{g} ) HCll B . ( 22.5 g H_{2} C_{2} O_{4} ) c. ( 32 g S O_{4} ) ( mathrm{D} cdot 38 mathrm{g} mathrm{FeSO}_{4} ) |
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316 | Which one of the following electronic configuration corresponds to the element with maximum electopositive character? A ( cdot[K r] 5 s^{1} ) в. ( [N e] 3 s^{1} ) c. ( [A r] 4 s^{1} ) D. ( [X e] 6 s^{1} ) |
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317 | In Newland’s classification, elements are arranged in an increasing order of their: A. mass number B. atomic number c. atomic weight D. all of these |
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318 | Elements ( A, B ) and ( C ) belong to the same period in the long form of the periodic table. The nature of the oxides of ( A, B ) and ( mathrm{C} ) is amphoteric, basic and acidic respectively. The correct order of the atomic numbers of these elements is: A. ( C>B>A ) в. ( C>A>B ) c. ( A>B>C ) D. ( B>A>C ) |
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319 | The properties that have increasing values with increase in atomic number for the elements of 1A are? I. Ionization energy (potential) I. Atomic radius III. Atomic mass A. I only B. III only c. I and II only D. Il and III only E . ।, ॥।, and III |
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320 | Number of unpaired electrons in inert gas is: A. 0 B. 8 ( c cdot 4 ) D. 18 |
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321 | Which of the following statement is false? A. Elements of ( n s^{2} n p^{6} ) electronic configuration lies in ( 1^{s t} ) to ( 6^{t h} ) period B. Typical elements lies in ( 3^{r d} ) period C. The seventh period will accommodate thirty two elements D. Boron and silicon are diagonally related |
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322 | Q8. Why do elements in the same group have similar physical and chemical properties? | 11 |
323 | When a Dobereiner triad is considered, the sum of atomic weights of extreme elements ( X ) and ( Z ) is 177.6 and difference of ( Z ) and ( Y ) is five times the number of protons present in a neon atom. Identify ( x, Y ) and ( z ) ( mathbf{A} cdot X rightarrow C a, Y rightarrow S r, Z rightarrow B a ) в. ( X rightarrow L i, Y rightarrow N a, Z rightarrow K ) c. ( X rightarrow K, Y rightarrow R b, Z rightarrow C s ) D. ( X rightarrow S r, Y rightarrow B a, Z rightarrow R a ) |
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324 | Identify the factor that distinguishes each element from every other element in the periodic table ? A. The number of protons in the nucleus B. The number of neutrons in the nucleus c. The number of electrons about the nucleus D. The total mass of the nucleus (protons plus neutrons) E. Its position in the periodic table |
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325 | Which of the following elements are metals? This question has multiple correct options A. Calcium B. Chlorine c. Potassium D. Sulphur |
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326 | If the valence electron configuration of this element is ( x s^{2} 6 f^{y} ) and ( 7 d^{z}, ) then find out the value of ( x, y ) and ( z ) A. ( x=8, y=14, z=10 ) B . ( x=7, y=12, z=10 ) c. ( x=9, y=10, z=10 ) D. None of the above |
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327 | Element with similar chemical properties: A. occur only within the same period B. have identical atomic mass(weight) C. have identical number of neutrons D. have the same number of electrons in the outer shell |
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328 | What is the valency of magnesium with atomic number ( 12 ? ) A . 2 B. 4 c. 5 ( D ) |
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329 | ( mathrm{Cl}, mathrm{Br}, mathrm{I} ) follows Dobereiner’s triads, the atomic masses of ( mathrm{Cl} ) and I are 35.5 and 127 respectively. The atomic mass of Br is : A . 162.5 B. 91.5 c. 81.25 D. 45.625 |
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330 | ( M g ) forms ( M g(I I), ) because of: A. The oxidation state of ( M g ) is +2 B. Difference between ( I . P_{1} ) and ( I . P_{2} ) is greater than 16.0 ( e v ) c. There are only two electrons in the outermost energy level of ( M g ) D. Difference between ( I . P_{1} ) and ( I . P_{2} ) is less than 11 ev |
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331 | Q. 1 Consider the isoelectronic species, Na+, Mg2+, F and 02. The correct order of increasing length of their radii is (a) F <0 < Mg2+ < Na+ (b) Mg2+ < Na+ <F <02- (c) O2- <F < Na+ < Mg2+ (d) O2- < < Mg2+ < Nat |
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332 | An element ( X ) (atomic number 17 ) reacts with an element Y (atomic number 12) to form a divalent halide. Where do ( x ) and Y are placed in the modern periodic table? (mention the group and period of each |
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333 | All elements of the same group will have: A. same electronic configuration B. similar outer electron configuration C. same ionization potential value D. different chemical properties |
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334 | Electronic configurations of few elements are given below. Mark the incorrect match. A ( cdot l s^{2} 2 s^{2} 2 p^{5} ) – Most electronegative element B. ( l s^{2} 2 s^{2} 2 p^{3}- ) An element belonging to 3rd period and 5 th group C ( cdot 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{8} 4 s^{2}- ) A d-block element D. ( 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} ) – An element from 18th group |
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335 | An element has six electrons in its outermost shell, then its valency can be ( A cdot 6 ) B. 2 ( c cdot 4 ) D. All of the above |
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336 | The element with ( Z=120 ) (not yet discovered) will be an/ a: A. transition metal B. inner-transition metal c. alkaline earth metal D. alkali metal |
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337 | Q26. What are major differences between metals and non-metals? | 11 |
338 | Which of the following is a transition element? A. Element with atomic number 2 B. Element with atomic number 7 c. Element with atomic number 19 D. Element with atomic number 35 E. Element with atomic number 74 |
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339 | The term periodicity is the properties of elements, which are arranged in the increasing order of their atomic numbers. Then the elements with similar properties: A. reoccur after a fixed interval B. reoccur after certain regular interval c. form vertical groups D. form horizontal rows |
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340 | State Newland’s law of octaves. | 11 |
341 | In laboratory burners, we use A. Producer gas B. oil gas c. Gobar Gas D. None of the above |
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342 | How do the following properties vary in a Period and in a Group? (A) Atomic radius (B) Ionization energy (C) Electronegativity (D) Electropositivity |
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343 | Which of the following is the most chemically reactive? A ( . L i ) в. ( N a ) c. ( K ) D. ( R b ) ह. ( C s ) |
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344 | All halogens are: A. s-block elements B. d-block elements C . representative elements D. transition elements |
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345 | Ratio of radii of ( mathrm{K}, mathrm{L}, mathrm{M} ) shells of hydrogen atom is : A. 1: 2: 3 B . ( 1: frac{1}{4}: frac{1}{9} ) c. 1: 4: 9 D. ( 1: frac{1}{2}: frac{1}{3} ) |
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346 | Which of the following has the largest radius? A ( . S r ) в. ( P ) c. ( M g ) D. ( A l^{3} ) E ( . M g^{2+} ) |
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347 | Q13. Explain why cation are smaller and anions larger in radii than their parent atoms? ILOV LI |
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348 | Sodium has compared to potassium. A. less electronegativity B. more ionization potential c. larger atomic radius D. lower melting point |
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349 | In which of the following reaction, Boron does not act as reducing agent? A. ( B+C O_{2} rightarrow ) в. ( B+M g rightarrow ) c. ( B+S i O_{2} rightarrow ) D. ( B+H N O_{3} rightarrow ) |
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350 | Name the anomalous pairs | 11 |
351 | Which element has least atomic diameter? A. ( F ) в. ( F e ) ( c cdot C l_{2} ) D. ( N a ) |
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352 | Statement ( I- ) Zinc and berylium have electron affinities which are significantly different from each other. Statement ( I I- ) Electron affinity is a measure of the energy used to add an electron to an atom. A. Statement ( I ) is true, Statement ( I I ) is true B. Statement I is true, Statement II is false c. statement ( I ) is false, statement ( I I ) is true D. Statement I is false, Statement ( I I ) is false E. Statement I is true, Statement ( I I ) is true and is a correct explanation of the phenomena described in 1 |
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353 | The electropositive character is the maximum for which of the following elements in Group 13? A ( cdot ) Al в. T c. Both of the above D. None of the above |
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354 | Identify the electronic configuration of an element whose atomic radii is determined by taking half the internuclear distance between like atoms. ( mathbf{A} cdot[H e] 2 s^{2} 2 p^{5} ) B . ( [A r] 4 s^{2} ) c. ( [N e] 3 s^{2} ) D ( cdot[K r] 4 d^{5} 5 s^{2} ) |
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355 | In a group from top to bottom, ionisation energy A. increases B. decreases c. remains same D. none of these |
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356 | Assertion Tin exhibits +2 and +4 oxidation states only and not +3 oxidation state. Reason Inert pair effect of electrons in the sorbital is responsible. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Assertion is incorrect but Reason is correct |
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357 | State True or False. The atomic number of Uus is 117 |
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358 | Pair having elements from same period is : A . Na,Ca B. Na,CI c. са,С D. Cl,Br |
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359 | The electronegativity of elements below sodium in the same group will be : A. lower B. higher c. same D. none of these |
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360 | What do oxygen atom and oxide ion have in common? A. Same size B. Same number of electrons c. Same electronic configuration D. Same number of protons |
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361 | The element in between lithium and potassium in Dobereiner’s classification is: A . Mg B. Na ( c cdot c a ) D. Rb |
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362 | Which is non-metal (excluding noble gas)? A. B. ( Q ) ( c cdot R ) ( D ) |
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363 | A metal that forms a stable binary halide of formula ( A X_{2}(X= ) Halogen) is : ( A ) B. 2 ( c cdot 3 ) D. |
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364 | In terms of polar character which one of the following orders is correct? ( mathbf{A} cdot H_{2} S<N H_{3}<H_{2} O<H F ) B. ( H_{2} S<N H_{3}<H_{2} SH_{2} O<N H_{3}<H_{2} S ) ( mathbf{D} cdot N H_{3}<H_{2} O<H F<H_{2} S ) |
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365 | In the following four elements, the ionisation potential of which one is the highest? A. Oxygen B. Argon c. Barium D. cesium |
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366 | Which one of the following pairs of atomic numbers represents elements belonging to the same group? A. 11 and 20 B. 13 and 30 c. 13 and 31 D. 14 and 31 |
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367 | Read below given tabular form and answer the questions. begin{tabular}{llll} Element & Electronic configuration & Element & Elec conf \ ( mathrm{He} ) & ( 1 s^{2} ) & ( mathrm{Kr} ) & ( 4 s^{2} 4 ) \ ( mathrm{Ne} ) & ( 2 s^{2} 2 p^{6} ) & ( mathrm{xe} ) & ( 5 s^{2} 5 ) \ ( mathrm{Ar} ) & ( 3 s^{2} 3 p^{6} ) & ( mathrm{Rn} ) & ( 6 s^{2} 6 ) \ hline end{tabular} Write the names of ‘noble gas’ elements |
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368 | 1) On the Pauling’s electronegativity scale,which element is next to ( F ) 2) Why ( C a^{2+} ) has smaller ionic radius ( operatorname{than} boldsymbol{K}^{+} ? ) |
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369 | How does number of valence electrons vary on moving from left to right In the first period of a periodic table? A . в. ( c cdot 2 ) D. |
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370 | lonization potential of ( N a ) would be numerically the same as: A. electron affiniy of ( N a^{+} ) B. electronegativity of ( N a^{+} ) c. electron affiniy of ( H e ) D. ionization potential of ( M g ) |
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371 | The metal showing resemblance with lithium is ( A . B e ) в. ( M g ) c. ( A l ) D. ( C a ) |
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372 | Which of the following is true about Mendeleev’s Periodic Table? A. Systematic study of elements B. Prediction of new elements c. correction of doubtful atomic weights D. All of the above |
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373 | Identify less reactive element from the following: ( mathbf{A} cdot_{8} Y^{16} ) B. ( _{10} Y^{20} ) C. ( _{11} Y^{23} ) D. ( _{9} Y^{19} ) |
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374 | The anomalous pairs in Mendeleev’s periodic table is/are ( A cdot C o, N i ) в. Te, c. Ar, ( k ) D. All the above |
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375 | Identify the odd one out: Barium, Radium, Calcium, Francium |
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376 | Which of the following elements will form acidic oxide? This question has multiple correct options A. Na a в. ( s ) ( c . ) мв D. P |
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377 | Arrange the elements ( F, N a, F e, C l, N e ) in increasing order of ionization energy. A. ( N a<F e<C l<FF>C l>F e>N a ) c. ( F e>C l>F>N e>N a ) |
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378 | Q6. Define the term ionization enthalpy? How does it vary along a period and along a group | 11 |
379 | Mendeleev’s classified elements in: A. Increasing order of atomic number B. Increasing order of atomic masses C. Decreasing order of atomic masses D. Decreasing order of atomic number |
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380 | Assertion According to Mendeleev’s periodic law; The properties of elements are the periodic a function of their atomic numbers. Reason Mendeleev’s periodic law could explain the phenomenon of anomalous pairs. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion C. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect |
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381 | Classification of elements are done on the basis of A. atomic number B. atomic weight c. valency D. none of these |
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382 | Which of the following is the correct electronic configuration of potassium? A .2,8,9 B. 8,2,9 c. 2,8,8,1 D. 1, 2,8, 8 |
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383 | Correct order of ( 1^{s t} ) IP among following elements Be, B, C, N, O is: ( A cdot B<B e<C<0<N ) B. ( B<B e<C<N<0 ) ( c cdot B e<B<C<N<0 ) ( D cdot B e<B<C<0<N ) |
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384 | Which of the following explains the reason why atomic radii decrease across a period? A. As you move across the period, the number of protons increases, which increases the nuclear charge. The number of electrons remains the same creating a larger Coulombic attraction and decreasing the radii B. As you move across the period, the number of protons and electrons increases. The increased Coulombic attraction decreases the overall size of the atom. C. As you move across the period, the number of protons remains constant while the number of electrons increases. The decreased Coulombic attraction decreases the overall size of the atom. D. The atomic radii do not decrease across a period. It actually increases, duh! |
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385 | In group I of alkali metals, the ionization potential decreases down the group. Therefore lithium is a poor reducing agent in gaseous state. A. True B. False |
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386 | As atomic radii increases, ionisation potential: A. increases B. decreases c. remains same D. none of the above |
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387 | Oxygen and sulphur are identical in respect of : A. chemical properties B. distribution of electrons in outer shell c. atomicity D. electronic configuration |
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388 | Elements in the same column/group of the periodic table have similar chemical properties because their atoms have the same A. number of protons B. number electrons c. number of valence electrons D. atomic mass |
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389 | Which element reacts most explosively in water? ( mathbf{A} cdot K ) в. ( C a ) ( c cdot B r ) D. ( K r ) E. ( Z n ) |
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390 | Which of the following elements follow Dobereiner’s law of Triads? A. ( mathrm{Na}=23, mathrm{Li}=7 ) and ( mathrm{K}=39 ) B. Cl = ( 35, mathrm{Br}=80 ) and ( mathrm{F}=19 ) c. ( mathrm{ca}=40, mathrm{Mg}=24 ) and ( mathrm{Sr}=88 ) D. ( mathrm{Na}=23, mathrm{K}=39 ) and ( mathrm{Rb}=85 ) |
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391 | The elements of one period are given below in order from left to right ( boldsymbol{L} boldsymbol{i}, boldsymbol{B} boldsymbol{e}, boldsymbol{B}, boldsymbol{C}, boldsymbol{O}, boldsymbol{F}, boldsymbol{N} boldsymbol{e} ) Which one of the above elements belongs to the halogen series? ( mathbf{A} cdot L i ) B. ( O ) ( c . F ) D. Ne |
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392 | Why is electronegativity directly proportional to ( s ) character? |
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393 | The main reason for showing anomalous properties of the first member of a group in s or p-block is : A. maximum chemical reactivity B. maximum electronegativity and different configurations c. small size, large charge, /radius ratio D. tendency to form multiple bonds |
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394 | Few values are given in the table in the direction from left to right and top to bottom. Predict the property which could be depicted in the table. A. Atomic number B. Ionisation enthalpy c. Atomic radius D. Electron gain enthalpy |
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395 | Which of the following statements is/are wrong? I) ( B i^{3+} ) is more stable than ( B i^{5+} ) II) ( M n ) shows +8 oxidation state. III) The oxidation state of an element is always less than or equal to its group number. IV) ( s- ) Block elements show variable oxidation states. A. Il and IV c. ।, ॥ and III D. II, III and IV |
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396 | The physical properties of elements changes according to A. classification of elements in groups and periods B. classification of elements in groups c. classification of elements in periods D. None of these |
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397 | Newland could classify elements only upto: A. copper B. chlorine c. calcium D. chromium |
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398 | The given arranged sequence on the basis of their increasing atomic masses represents which law of classification of elements? ( boldsymbol{F}, boldsymbol{N} boldsymbol{a}, boldsymbol{M} boldsymbol{g}, boldsymbol{A l}, boldsymbol{S} boldsymbol{i}, boldsymbol{P}, boldsymbol{S}, boldsymbol{C l} & boldsymbol{K} ) A. Modern table B. Newton’s law c. Newland’s law of octaves D. Mendeleev’s periodic table |
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399 | If the valence shell electronic configuration for an element is ( n s^{2} n p^{5} ) this element belongs to the group of A. alkali metals B. inert metals c. noble gases D. halogens |
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400 | Why do third period elements expand their coalence above four? |
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401 | John Newlands arranged the known elements in a/an order of their atomic A. increasing, masses B. decreasing, masses c. increasing, numbers D. decreasing, numbers |
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402 | The electronic configuration of ( boldsymbol{R} boldsymbol{b}^{+} ) in absence of Aufbau Principle, is: A ( cdot 1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{6} 3 d^{10}, 4 s^{2} 4 p^{6} ) B ( cdot 1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{3} 3 p^{6} 3 d^{10}, 4 s^{2} 4 p^{4} ) c. ( 1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{6} 3 d^{10}, 4 s^{2} 4 p^{3} ) D. None of these |
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403 | What is the correct name of ( C l O_{2} ? ) A. Chlorine dioxide B. Chlorine (II) oxide c. Chlorine oxide D. Monochlorine dioxide E. Chlorine dioxygen |
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404 | The charge/size ratio of a cation determines its polarizing power. Which one of the following sequences represents the increasing order of the polarizing power of the cationic species, ( mathrm{K}^{+}, mathrm{Ca}^{2+}, mathrm{Mg}^{2+}, mathrm{Be}^{2+} ? ) ( A cdot M g^{2+}<B e^{2+}<K^{+}<C a^{2+} ) B. ( B e^{2+}<K^{+}<C a^{2+}<M g^{2} ) C ( cdot mathrm{k}^{+}<mathrm{Ca}^{2+}<mathrm{Mg}^{2+}<mathrm{Be}^{2+} ) D. ( mathrm{Ca}^{2+}<mathrm{Mg}^{2+}<mathrm{Be}^{2+}<mathrm{K}^{+} ) |
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405 | ( mathbf{a} ) b ( d ) As ( mathrm{Sn} ) ( e ) Te What are a, b, c, d and e in the given figure ? ( A cdot a=S i b=P c=S d=G e e=S b ) ( B cdot a=sin b=P c=S d=S b e=G e ) ( mathbf{C} cdot a=mathrm{Si} mathrm{b}=mathrm{P} mathrm{c}=mathrm{Sb} mathrm{d}=mathrm{S} mathrm{e}=mathrm{Ge} ) D. ( a=P b=S c=S i d=G e e=S b ) |
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406 | The set representing the correct order of first ionization potential is : ( A cdot K>N a>L i ) в. ( mathrm{Mg}>mathrm{Be}>mathrm{Ca} ) C. ( B>C>N ) D. ( S c>Y>L a ) |
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407 | Which group of elements could be placed in Mendeleev’s Periodic Table without disturbing the original order? A . Alkali metals B. Alkaline earth metals c. Non – metals D. Noble gases |
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408 | Arrange ( s, p ) and ( d ) sub-shells of a shell in the increasing order to effective nuclear charge ( left(Z_{e f f}right) ) experienced by the electron present in them. ( A cdot s>p>d ) B. p>s>dd ( c cdot d>p>s ) D. none of the above |
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409 | Noble gases do not react because they have electrons in their valence shell. ( A cdot 3 ) B. 6 ( c ) D. 8 |
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410 | Q. 28 Among the elements B, AL, C and Si, (a) which element has the highest first ionisation enthalpy? (b) which element has the most metallic character? Justify your answer in each case. |
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411 | The properties which are not common to both groups 1 and 17 elements in the periodic table are: A. electropositive character increases down the groups B. reactivity decreases from top to bottom in these groups c. atomic radii increases as the atomic number increases D. electronegativity decreases on moving down group |
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412 | Which of the following sets of atomic masses do not correspond to Dobereiner’s triad? This question has multiple correct options A. 7,23,39 B. 20, 38, 56 c. 47,91,178 D. 54, 95, 183 |
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413 | The elements of groups, 1,2,13,14,15,16 and 17 are collectively called: A. Noble gases B. Representative or normal elements c. Transition elements D. Inner transition elements |
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414 | The total number of elements present in 6th period are: ( A cdot 18 ) B. 31 c. 32 D. 17 |
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415 | Assertion ( P b I_{4} ) doesn’t exist and converts into ( P b I_{2} ) and ( I_{2} ) spontaneously at room temperature but ( P b C l_{4} ) needs heating to convert into ( P b C l_{2} ) and ( C l_{2} ) Reason ( P b^{2+} ) is more stable than ( P b^{4+} ) due to inert pair effect. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion. B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion. C. Assertion is correct but Reason is incorrect. D. Assertion is correct but Reason is not correct. |
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416 | Which of the following is not correct statement for periodic classification of elements? A. The properties of elements are the periodic functions of their atomic number B. Non-metallic elements are less in number than metallic elements c. For transition elements, the last electron enters into (n – 2) d-subshell D. None of these |
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417 | Why did Mendeleev’s leave some gaps in his periodic table of elements? | 11 |
418 | is the electronic configuration of the highest electronegative element. |
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419 | Write the periodic properties which always increases along the periodic table in moving from left to right? | 11 |
420 | ( 25 mathrm{cm}^{3} ) of oxalic acid completely neutralise 0.064 g of sodium hydroxide. Molarity of the oxalic acid solution is A .0 .064 B. 0.045 begin{tabular}{l} c. 0.015 \ hline end{tabular} D. 0.032 |
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421 | The electronegativity of fluorine obtained from the following data is ( x ) ( boldsymbol{E}_{boldsymbol{H}-boldsymbol{H}}=mathbf{1 0 4} . boldsymbol{2} boldsymbol{k} boldsymbol{c} boldsymbol{n} boldsymbol{m} boldsymbol{l}^{-1} ) ( boldsymbol{E}_{boldsymbol{F}-boldsymbol{F}}=mathbf{3 6 . 6} ) kcal ( boldsymbol{m o l}^{-1} ) ( boldsymbol{E}_{boldsymbol{H}-boldsymbol{F}}=mathbf{1 3 4 . 6} boldsymbol{k c a l} boldsymbol{m o l}^{-1} ) Electronegativity of hydrogen ( =2.1 ) Find the value of ( x ) to the nearest integer. |
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422 | The graph below shows the atomic radii of atoms in picometers ( (mathrm{pm}) ) as a function of atomic number. Which letter on this graph most closely shows the location of the transition metals of period 5? Atomic Radius vs. Atomic Number |
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423 | Which of the following is true about Mendeleev’s periodic table? A. The accommodation of the noble gases in the periodic table did not disturb the position of other elements B. Noble gases were known at the time when Mendeleev gave the periodic table C. When noble gases were discovered, they got a place in Mendeleev’s periodic table as a separate row D. All of the above |
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424 | The element 119 has not been discovered. What would be the symbol for this element? A. ( U u e ) в. UUe c. ( U U E ) D. None of these |
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425 | 0.41 The radius of Na+ cation is less than that of Na atom. Give reason. Alben |
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426 | Which of the following pair of element has same property? This question has multiple correct options A ( cdot 10,12 ) B. 11,20 c. 20,38 D. 13, 31 |
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427 | ( M^{3+} ) has electronic configuration as ( [A r] 3 d^{10}, ) hence it lies in: A. ( s ) -block B. p-block c. ( d ) -block D. ( f ) -block |
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428 | Law of Triad was proposed by: A. Newland B. Gay Lussac C . Mendeleev D. Dobereiner |
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429 | What is the trick to memorize periodic table? |
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430 | Elements with eight electrons in their outermost energy shell are called: A. noble gases B. halogens c. alkalis D. oxides |
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431 | If screening effect is not considered, and thus effective nuclear charge is the atomic number then the larger radius out of ( L i, N a ) is 11 (consider only atomic number) |
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432 | The electronic configuration of an element is ( 2,8,8,2 . ) This element is : A. An alkali metal B. An alkaline earth metal c. A halogen D. A noble gas |
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433 | An element ( Z ) has atomic number 16 . Answer the following questions on ( Z ) : State the formula between ( Z ) and Hydrogen? |
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434 | The wavelength of a spectral line in Lyman series, when electronjumps back from 2nd orbit, is: в. 1216 А c. ( 1362 dot{h} ) D. None of the above |
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435 | Assertion Across the period effective nuclear charge decreases. Reason The third period contains only 8 elements and not 18 like 4 th period. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion C. Assertion is incorrect but Reason is correct D. Both Assertion and Reason are incorrect |
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436 | How does tendency to lose electrons change in a period and why? |
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437 | Q5. Which two elements of the following belong to the same period? AI, Si, Ba and O |
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438 | in Mendeleev’s periodic table was not possible. |
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439 | If ( X ) and ( Y ) are two elements which belong to same group of Newland’s periodic table, how many elements exists between ( X ) and ( Y ? ) A . 4 B. 5 ( c cdot 6 ) D. |
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440 | Arrange ( F, C, O, N ) in the decreasing order electronegativity: A. ( O>F>N>C ) в. ( F>N>C>0 ) c. ( C>F>N>O ) D. ( F>O>N>C ) |
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441 | Which compound is mainly responsible for the depletion of ozone layer? A. ( C O_{2} ) в. ( C H_{4} ) c. ( C H_{3} ) ОН D. ( C F_{2} C l_{2} ) |
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442 | The pair of elements having same number of valence electrons are This question has multiple correct options A. ( Z n, M g ) в. ( C l, ) c. ( N a, C a ) D. ( C, G e ) |
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443 | Reactivity of elements …….. down the group. A. increases B. decreases c. increases and then decreases D. decreases and then increases |
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444 | If the same element is forming oxides in different oxidation states then: A. that oxide will be neutral in nature in which element will be in its highest oxidation state B. the oxide will be highest acidic in nature in which element will be in its highest oxidation state c. that oxide will be amphoteric in nature in which element will be in its highest oxidation state D. that oxide will be highly basic in nature in which element will be in its highest oxidation state |
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445 | What is electronegativity, and how it is related to the type of bond formed? | 11 |
446 | Study the image above. How are the elements arranged in the modern periodic table? A. Elements are arranged by their atomic numbers B. Elements are arranged by their atomic mass C. Elements are arranged by their valence electron configurations. D. Electrons are arranged in alphabetical order |
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447 | Why are noble gases missing from Newland’s octaves? | 11 |
448 | The first element of group number 15 is: A. carbon B. nitrogen c. oxygen D. beryllium |
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449 | The number of elements present in fourth period is: A . 32 B. 8 ( c cdot 18 ) ( D ) |
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450 | The groups from ( 1^{s t} ) to ( 7^{t h} ) of Mendeleev’s periodic table were divided into ( _{-}-_{-}-_{-}- ) subgroups A .2 B. 3 ( c cdot 4 ) D. |
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451 | The electronic configuration of the element which is just above the element with atomic number 43 in the same periodic group is: ( mathbf{A} cdot 1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{6} 3 d^{5}, 4 s^{2} ) B ( cdot 1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{6} 3 d^{10} 4 s^{2} 4 p^{5} ) C ( cdot 1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{6} 3 d^{6}, 4 s^{1} ) D. ( 1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{6} 3 d^{10}, 4 s^{1} 4 p^{6} ) |
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452 | Which of the following match is correct? A. Mendeleev periodic table is based on number of protons B. One of the Doberenier’s triad is ( N a, K, R b ) C. Newland’s octave rule is obeyed by ( H, F, C l ) D. Lother meyer curve plotted between atomic number and atomic weight |
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453 | Number of elements present in Period 1 are ( A cdot 2 ) B. 4 ( c .6 ) ( D ) |
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454 | As we move from left to right, the electronegativity increases. An atom which is highly electronegative has: A. large size B. low electron affinity c. high ionisation enthalpy D. low chemical reactivity |
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455 | Structures of nuclei of three atoms ( A, B ) and ( C ) are given below- A has 90 protons and 146 neutrons B has 92 protons and 146 neutrons C has 90 protons and 148 neutrons Based on the above data, which of these atoms are isotopes and which are İsobars? ( A cdot A ) and ( C ) are isotopes; ( B ) and ( C ) are isobars B. A and B are isotopes; A and C are isobars C. ( B ) and ( C ) are isobars; ( A ) and ( B ) are isobars D. ( A ) and ( C ) are isotopes; ( A ) and ( B ) are isobars |
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456 | The name given by Newlands to the arrangement created by him was: A. law of octane B. law of octaves c. law of octagon D. law of eight elements |
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457 | Write down the characteristics of the elements having atomic number 17 Electronic configuration Period number Group number Element family No. of valence electrons Valency Metal or non-metal |
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458 | Elements of same group in the periodic table are characterised by the same: A. ionization potential B. electronegativity c. electron affinity D. number of valency electrons |
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459 | Assertion In the present form of periodic table, the period number corresponds to the highest principal quantum number of the elements in the period. Reason Elements having similar outer electronic configurations in their atoms belong to same period. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion C. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect |
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460 | What does ‘like dissolves like’ mean? A. That compounds that are from the same period on the periodic table will dissolve each other. B. Polar solutes dissolve in polar solvents. C. Nonpolar solutes dissolve in polar solvents. D. Polar solutes dissolve in nonpolar solvents. E. That compounds from the same family on the periodic table will dissolve each other. |
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461 | The atomic number of third alkali metal is : ( mathbf{A} cdot mathbf{3} ) B. 11 c. 19 D. 37 |
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462 | Give the electronic configuration of fifth element of the first transition series. | 11 |
463 | Q. 29 Write four characteristic properties of p-block elements. | 11 |
464 | Q.52 Write down the outermost electronic configurations of alkali metals. How will you justify their placement in group 1 of the periodic table? |
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465 | 0.34 p-block elements form acidic, basic and amphoteric oxides. Explain each property by giving two examples and also write the reactions of these oxides with water. |
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466 | According to Mendeleev’s periodic law, the properties of elements are a periodic function of: A. atomic number B. atomic weight c. number of electrons D. density |
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467 | On moving down the group from ( boldsymbol{F} ) to ( boldsymbol{I} ) which of the properties decrease? This question has multiple correct options A. Ionic radius B. Ionization energy c. oxidizing agent D. Electronegativity |
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468 | Which of the following statements is incorrect about the trends in periodic properties in the periodic table ? A. Metallic character increases from Li to Cs B. The acidity of oxides increases from left to right in a period C. Noble gases have the highest electron affinity among all the elements in the periodic table D. Ionisation energy of aluminium is lower than that of magnesium |
11 |
469 | The formula of hydride of the halogen in period 3 is: A. ( H C l_{2} ) в. ( H C l_{3} ) c. ( H_{2} C l_{4} ) D. ( H C l ) |
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470 | The total number of metals discovered so far are: ( mathbf{A} cdot 92 ) B. 82 c. 80 D. 11 |
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471 | Which ranks the following atoms ( (L i, N a, K, R b) ) from the smallest to largest atomic radius? A. ( L i<N a<K<R b ) в. ( R b<K<N a<L i ) c. ( K<N a<L i<R b ) D. ( N a<L i<R b<K ) |
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472 | Out of ( N a^{+}, M g^{+2}, O^{-2} ) and ( N^{-3}, ) the pair of species having the minimum and the maximum IP would be? A ( . N a^{+}, M g^{+2} ) B . ( M g^{+2}, N^{-3} ) C . ( N^{-3}, M g^{+2} ) D. ( O^{-2}, N^{-3} ) |
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473 | Four elements ( A, B, C, D ) have 1,2,6,7 valence electrons in their atoms. Assuming that they belong to the same period identify the strongest oxidizing agent among them. ( A cdot A ) B. B ( c cdot c ) D. |
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474 | Lothar Meyer obtained the curve for the known elements by plotting their atomic volumes against: A. atomic numbers B. atomic masses c. densities D. ionization energies |
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475 | Q. 20 In which of the following options order of arrangement does not agree with the variation of property indicated against it? (a) AP+ < Mg2+ < Na+ <F (Increasing ionic size) (b) B<C<N< (Increasing first ionisation enthalpy) (c) I< Br< Cl< F (Increasing electron gain enthalpy) (d) Li< Na<K< Rb (Increasing metallic radius) |
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476 | Recently (in 2003) element with atomic number 110 has been named by IUPAC as: A. ( H s ) в. ( M t ) ( c . D s ) D. ( S g ) |
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477 | The correct set of four quantum numbers for the valence electron of rubidium atom ( (Z=37) ) is ( mathbf{A} cdot+5,+1,+1 / 2 ) В. ( 6,0,0,+1 / 2 ) c. ( 5,0,0,+1 / 2 ) D. None of the above |
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478 | IUPAC representation of the element of atomic number 115 is Uup. If true enter 1 else enter 0 | 11 |
479 | When Li, Na, and K are placed in decreasing order of their ionisation energy, the order is : A . Li, к, Na B. ( mathrm{K}, mathrm{Na}, mathrm{Li} ) c. Na, Li, K D. Li, Na, K |
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480 | Which is not anomalous pair of elements in the Mendeleev’s periodic table? ( mathbf{A} cdot A r ) and ( K ) B. ( C o ) and ( N i ) c. ( T e ) and ( I ) D. ( A l ) and ( S i ) |
11 |
481 | The atoms of elements belonging to the same group of periodic table have the same : A. number of protons B. number of electrons c. number of neutrons D. number of electrons in the outermost shell |
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482 | Magnesium is present in: A. ascorbic acid B. vitamin B ( _{12} ) c. chlorophyll D. haemoglobin |
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483 | State the position of cerium ( (z=58) ) and uranium ( (z=92) ) in periodic table? | 11 |
484 | On moving from left to right in any period valence electrons keeps on increasing and period gets over when that valence shell gets filled. A . True B. False |
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485 | From among the elements, choose the following: ( mathrm{Cl}, mathrm{Br}, mathrm{F}, mathrm{O}, mathrm{Al}, mathrm{C}, mathrm{Li}, mathrm{Cs} ) and ( mathrm{Xe} ) The element which shows diagonal relationship with Mg. |
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486 | Calculate the energy required for the process: ( boldsymbol{H} boldsymbol{e}^{+}(boldsymbol{g}) rightarrow boldsymbol{H} boldsymbol{e}^{2+}(boldsymbol{g})+boldsymbol{e}^{-} ) If the ionisation energy for the H atom in the ground state is ( 2.18 times 10^{-18} ) J/atom. |
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487 | Which of the following pairs has both members from the same group of the periodic table? A. ( N a, C a ) в. ( N a, C l ) c. ( C a, C l ) D. ( C l, B r ) |
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488 | What is the name of the element with atomic number ( 105 ? ) A. Dubnium B. Holmium c. Kurchatovium D. Nobelium |
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489 | lonisation potential of boron is less than that of beryllium. This is because: A . B has ( 1 s^{2} 2 s^{2} 2 p^{1} ) configuration B. B has small atomic size c. B has higher nuclear charge D. B has more number of shells |
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490 | Q. 48 Assertion (A) Electron qain enthalpy becomes less negative as we go down a group. Reason (R) Size of the atom increases on going down the group and the added electron would be farther from the nucleus. (a) Assertion and reason both are correct statements but reason is not correct explanation for assertion. (b) Assertion and reason both are correct statements and reason is correct explanation for assertion. (c) Assertion and reason both are wrong statements. (d) Assertion is wrong statement but reason is correct statement. |
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491 | Which of the following pairs has both members from the same group of periodic table? A. ( M g, B a ) в. ( M g, N a ) c. ( M g, C u ) D. ( M g, K ) |
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492 | What is the electronic arrangement of G ( ? ) A. 2,2,5 B. 2, 4, 3 c. 2,7 D. 2, 5, 2 |
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493 | The characteristics which remains same on moving down a sub-group: A. atomic size B. ionization potential c. valence shell electrons D. electronegativity |
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494 | Assertion ( left[A lleft(H_{2} Oright)_{6}right]^{3+} ) is a stronger acid than ( left[boldsymbol{M} boldsymbol{g}left(boldsymbol{H}_{2} boldsymbol{O}right)_{6}right]^{2+} ) Reason Size of ( left[A lleft(H_{2} Oright)_{6}right]^{3+} ) is smaller than ( left[M gleft(H_{2} Oright)_{6}right]^{2+} ) and possesses more effective nuclear charge. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect |
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495 | The lightest gas is : A. nitrogen B. helium c. oxygen D. hydrogen |
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496 | Which of the following statements related to the modern periodic table is incorrect? (a) The p-block has 6 columns because a maximum of 6 electrons can occupy all the orbitals in a p-shell (b) The d-block has 8 columns because a maximum of 8 electrons can occupy all the orbitals in a d-subshell (c) Each block contains a number of columns equal to the number of electrons that can occupy that subshell (d) The block indicates value of azimuthal quantum number (I) for the last subshell that received electrons in building up the electronic configuration |
11 |
497 | which of the following statements is true about effective nuclear charge? This question has multiple correct options A. ( Z_{text {eff}} ) decreases from top to bottom B. ( Z_{text {eff}} ) increases from top to bottom C. ( Z_{text {eff}} ) increases as we move from left to right in periodic table D. ( Z_{e f f}=Z times sigma ) (here ( sigma ) is screening constant |
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498 | Q. 42 Among alkali metals which element do you expect to be least electronegative and why? AO |
11 |
499 | Q.55 Discuss and compare the trend in ionisation enthalpy of the elements of group 1 with those of group 17 elements. |
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500 | Consider the following steps. ( boldsymbol{A}(boldsymbol{g}) overrightarrow{boldsymbol{E}_{1}} ) ( boldsymbol{A}^{+}(boldsymbol{g}) underset{boldsymbol{E}_{2}}{longrightarrow} boldsymbol{A}^{2+}(boldsymbol{g}) underset{boldsymbol{E}_{3}}{longrightarrow} boldsymbol{A}^{3+}(boldsymbol{g}) ) Third ionization energy of ( boldsymbol{A}(boldsymbol{g}) ) is ( ? ) A. ( E_{1}+E_{2} ) B . ( E_{1}+E_{2}+E_{3} ) ( mathbf{c} cdotleft(E_{1}+E_{2}+E_{3}right)^{/ 3} ) D. ( E_{3} ) |
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501 | Q1. State the Modern Periodic Law. | 11 |
502 | Why first ionization enthalpy of nitrogen is more than oxygen? |
11 |
503 | Assertion: Inert gases are monoatomic. Reason: Inert gases have stable configuration. A. Both assertion and reason are true and the reason is a correct explanation of the assertion B. Both assertion and reason are true but reason is not a correct explanation of the assertion C. The assertion is true but reason is false D. Both the assertion and reason are false E. The assertion is false but the reason is true |
11 |
504 | In the third period of the periodic table,the element having smallest size is : A. ( N a ) в. ( A r ) c. ( C l ) D. ( s i ) |
11 |
505 | The atomic number of a halogen element in the fourth period is ( 35 . ) If true enter ( 1, ) else enter 0 |
11 |
506 | Examples of elements belonging to ( s, p, d ) or ( f- ) block are given below. Identify the wrong example. A. ( s ) -block element – Caesium B. ( p ) -block element – Barium c. ( d ) – block element – Chromium D. ( f ) -block element – Thorium |
11 |
507 | The most significant contribution towards the development of periodic table was made by: A. Mendeleev B. Avogadro c. Dalton D. Cavendish |
11 |
508 | In Newlands’ table, which of the following elements was not placed in the same group in which cobalt and nickel were present? A. Chlorine B. Bromine C. Fluorine D. None of the above |
11 |
509 | With the increase in atomic number, screening effect increases both in group and period. A. True B. False |
11 |
510 | An element with atomic number ’32’ belongs to A. 4th period, VIA group B. 3rd period, IV A group c. 4 th period, IV A group D. 5th period, va group |
11 |
511 | Q4. Name different blocks of elements in the periodic table. Give general electronic configuration of each block. n itontie 109 |
11 |
512 | Mendeleev used a Sanskrit numeral before the names of the predicted elements. What was the term used for it? A. sasi B. Eka c. Astan D. Pancan |
11 |
513 | What is the apparent oxidation state of ( C ) element in the compound ( C O_{2} ? ) ( A cdot+2 ) B. – 2 ( c cdot+4 ) D. – ( mathrm{E} cdot+5 ) |
11 |
514 | In the given elements, which element does not have 2 valence electrons? A. Ba B. zn c. Na D. ca |
11 |
515 | Which period is incomplete in the modern periodic table? A . ( 1 s ) B. 2nd ( c cdot ) 6th D. 7th |
11 |
516 | Which of the following has the highest ionization energy? A. ( C ) в. ( N ) ( c cdot O ) D. ( F ) E . ( N e ) |
11 |
517 | In the modern periodic table, how does the atomic size of the elements vary along the period and down the group? Explain. |
11 |
518 | The placement of elements in the Newlands’ table was compared to: A. weeks of a month B. notes of music c. months of a year D. days of a month |
11 |
519 | The outermost electronic configuration of the most electronegative element is: ( mathbf{A} cdot n s^{2} n p^{3} ) В. ( n s^{2} n p^{6} ) ( c cdot n s^{2} ) D. ( n s^{2} n p^{5} ) |
11 |
520 | Assertion ( boldsymbol{S} boldsymbol{c}(boldsymbol{Z}=mathbf{2 1}) ) is placed in d-block elements. Reason Last filling electron goes into ( 3 d- ) suborbit. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Assertion is incorrect but Reason is correct |
11 |
521 | A hydrogen like atom with atomic number ( Z ) is in higher excited state of quantum number ‘n’. This excited state atom can make a transition to the first excited state by successively emitting two photons of energies ( 10 mathrm{eV} ) and ( 68.2 mathrm{eV} ) respectively. Alternatively the atom from the same the same excited state can make a transition to the 2 nd excited state by emitting two photons of energies ( 4.25 mathrm{eV} ) and ( 5.95 mathrm{eV} ) respectively Calculate the value of ( z ) |
11 |
522 | Periodic Table(Abbreviated): The element that will react in a 1: 1 ratio with (D) is: begin{tabular}{|c|c|c|c|c|c|} hline ( mathbf{z}_{mathbf{L i}} ) & & & & & ( mathbf{( D )} ) & ( mathbf{1 0} ) \ hline & ( mathbf{( A )} ) & & & & ( mathbf{( C )} ) & & \ hline ( mathbf{( B )} ) & ( mathbf{2 0} ) & & & & & \ hline end{tabular} B. ( r ) D |
11 |
523 | Which of the following statement(s) about the Modern periodic table is/are incorrect? (i) The elements in the Modern periodic table are arranged on the basis of their decreasing atomic number. (ii) The elements in the Modern periodic table are arranged on the basis of their increasing atomic number (iii) Isotopes are placed in an adjoining group(s) in the periodic table. A. (i) only B. (i) and (ii) c. (ii) and (iii) D. (i) and (iii) |
11 |
524 | Arrange the elements in increasing order of atomic radius ( mathrm{Na}, mathrm{Rb}, mathrm{K}, mathrm{Mg} ) A. ( mathrm{Na}<mathrm{K}<mathrm{Mg}<mathrm{Rb} ) B. ( K<N a<M g<R b ) ( mathrm{c} cdot mathrm{Mg}<mathrm{Na}<mathrm{K}<mathrm{Rb} ) D. ( R b<K<M g<N a ) |
11 |
525 | 09. Give the electronic configuration of the transition elements. Write their four important characteristics. Ans. The d-block elements are not |
11 |
526 | Given below are some elements of the modern periodic table: ( _{4} B e,_{26} F e,_{14} S i,_{19} K,_{20} C a ) (i) Select the element that has one electron in the outermost shell and write its electronic configuration. (ii) Select two elements that belong to the same group. Give reason for your answer. (iii) Select two elements that belong to the same period. Which one of the two has bigger atomic size? |
11 |
527 | ( I P_{1} ) and ( I P_{2} ) of Mg are 178 and ( 348 mathrm{K} ) cal ( m o l^{-1} . ) The enthalpy required for the reaction ( M g rightarrow M g^{2+}+2 e^{-} ) is: A ( . .+170 ) K.cal B. +526 K.cal c. -170 K.cal D . -526 K.cal |
11 |
528 | IUPAC symbol of atomic number 119 A. ( U u h ) в. Uun c. ( U u e ) D. ( U u b ) |
11 |
529 | Which of the following pair of elements follows Newland’s law of octave? A. ( N e, A r ) в. ( C, N ) c. ( N a, K ) D. ( P, S ) |
11 |
530 | According to classification of elements most of non-metals are placed in block A. ( s ) -block B. ( p ) – block c. ( d ) – block D. ( f ) – block |
11 |
531 | The period of element having three shells with three electrons in valence shell is: ( A cdot 2 ) B. 3 ( c cdot 4 ) D. 5 |
11 |
532 | Which of the following gaseous molecules is monoatomic? A. Chlorine B. Helium c. oxygen D. Nitrogen |
11 |
533 | Which of the following is general electron configuration of ( 4 d ) series? ( mathbf{A} cdot 4 s^{1+o 2} 3 d^{1+t 01} ) B. ( 4 s^{1 t o 2} 4 d^{1+t 01} ) ( mathbf{c} cdot 5 s^{1 t o 2} 5 d^{1 t o 10} ) D. ( 5 s^{1 operatorname{to} 2} 4 d^{1 text { lto } 10} ) |
11 |
534 | Which one of the following does not increase while moving down the group of the periodic table? A. Atomic radius B. Metallic character c. Valence electrons D. None of the above |
11 |
535 | The properties of the elements, as well as the formulae and properties of their compounds depend in a periodic manner on the atomic weights of the elements. This periodic law was given by : A. J.L. Meyer B. John A.R. Newlands c. Dobernier D. D.I. Mendeleev |
11 |
536 | Which of the following burns to form an oxide, which is gaseous at room temperature? A. Hydrogen B. Phosphorus c. Calcium D. Sulphur |
11 |
537 | The electronic configuration of transition elements is: A ( cdot n s^{1} ) B . ( n s^{2} n p^{5} ) c. ( n s^{2}(n-1) d^{10} ) D . ( (n-1) d^{1-10} n s^{0}-2 ) |
11 |
538 | Which of the following groups contains metals, non-metals and metalloids? A. Group 17 B. Group 14 c. Group 13 D. Group 12 |
11 |
539 | Q7. What are horizontal rows and vertical columns of the periodic table called? | 11 |
540 | The outer most shell of a representative element contains ‘a’ electrons and penultimate shell contains ‘b’ electrons. The valency of the element will be: A ( cdot a+b ) в. ( b-a ) ( c cdot b ) D. ( a ) or ( 8-a ) |
11 |
541 | If Aufbau rule is not followed, ( boldsymbol{K}-mathbf{1 9} ) will be placed in block. A . ( s ) B . ( p ) ( c cdot d ) D. ( f ) |
11 |
542 | Which element has the symbol ( W ? ) A. Silver B. Vanadium c. Tin D. Platinum E . Tungsten |
11 |
543 | Which of the following statement (s) is/are true regarding the change: ( boldsymbol{C N}^{-} rightarrow boldsymbol{C N O}^{-} ? ) This question has multiple correct options A. Carbon is losing two electrons per atom. B. The oxidation state of carbon change from +2 to +4 c. oxidation state of nitrogen is not changing D. oxidation state of nitrogen changes from – 3 to – |
11 |
544 | Q19. The first ionization enthalpy values (in kJ mol) of group 13 elements are: B AL Ga In T 801 577 579 558 589 How would you explain this deviation from the general trend? 1 funm to Alie due to the bigger size of A |
11 |
545 | Match List I and List II. | 11 |
546 | The long form of the periodic table consists of ( _{-} ) horizontal rows and vertical columns A. 6 and 17 B. 7 and 7 c. 5 and 7 D. 7 and 18 |
11 |
547 | 0.45 Electronic configuration of some elements is given in Column I and their electron gain enthalpies are given in Column II. Match the electronic configuration with electron gain enthalpy. Column ! Column II (Electronic configuration) (Electron gain enthalpy/kJmol”‘ A. 15² 25 206 -53 15² 25² 2p 3s’ 152 25 2p -141 15 25² 2p+ + 48 -328 D. |
11 |
548 | ( 1 mathrm{s}^{2} 2 mathrm{s}^{2} 2 mathrm{p}^{6} ) is the electron configuration of: A. nitrogen B. boron c. argon D. neon |
11 |
549 | The element with atomic number 35 belongs to : A. s -block B. p-block c. d.-block D. f-block |
11 |
550 | Define electronegativity. Why standard entropy of an elementary substanceis not zero whereas standard enthalpy of formation is taken as zero? |
11 |
551 | 2. 7 Among halogens, the correct order of amount of energy released in electron gain (electron gain enthalpy) is (a) F > Cl> Br>I (b) F< Cl< Br<I (c) FBr>I (d) F< Cl< Br<I |
11 |
552 | Which of the following match is correct? A. last natural element- Uub B. General electronic configuration of IA group – ( n s^{2} ) C. inert gas lies in ( 2^{n d}-6^{t h} ) period D. Typical elements – ( 3^{r d} ) period elements |
11 |
553 | The atomic number of element Unq is: A . 102 B. 103 ( c cdot 104 ) D. 105 |
11 |
554 | Why ( B e O ) and ( A l_{2} O_{3} ) are amphoteric? | 11 |
555 | Which of the following element belongs to the group ( 18 ? ) ( mathbf{A} cdot H ) в. ( N e ) c. ( C l ) D. ( F ) |
11 |
556 | Elements with atomic number greater than 92 are called actinides. A. True B. False |
11 |
557 | Atom with atomic radii and ionisation potential tends to gain electrons A. large, high B. large, low c. small, low D. small, high |
11 |
558 | Assertion According to Mendeleev, periodic properties of elements are periodic function of their atomic number Reason Atomic number is equal to the number of protons. A. Both Assertion and Reason are correct and Reason is the correct explanation of Assertion. B. Both Assertion and Reason are correct, but Reason is not the correct explanation of assertion. c. Assertion is correct but Reason is incorrect D. Assertion is incorrect but Reason is correct |
11 |
559 | IP values of an element ‘X’ are 104 kJ, ( 200 mathrm{kJ}, 420 mathrm{kJ}, 2825 mathrm{kJ} ) per mole Identify the group to which the element belongs ? A . ( I A ) в. ( I I A ) c. ( I I I A ) D. ( I V A ) |
11 |
560 | Q23. How would you react to the statement that the electronegativity of Non Pauling scale is 3.0 in all the nitrogen compounds? |
11 |
561 | Which of the following species has the highest electron affinity? A. ( F ) в. ( O ) ( c cdot O ) D. ( N a^{+} ) |
11 |
562 | Which of the following is(are) the merit(s) of Mendeleev’s periodic table? A. Could also predict the properties of these unknown elements B. Grouping of chemically dissimilar elements. c. Position given to isotopes. D. Presence of anomalous pairs |
11 |
563 | Write present names of Eka-aluminium and Eka-silicon. | 11 |
564 | Hydrogen resembles halogens as: A. hydrogen forms diatomic molecule B. it combines with metal and non-metals to form compounds C. both ( A ) and ( B ) D. none of the above |
11 |
565 | Which order of relative size among the following is incorrect? A. ( L i<N a<K ) в. ( C<S iA l<N a ) D. ( F<C l<B r ) |
11 |
566 | Element Electronegative begin{tabular}{ccc} ( P ) & 2.1 \ ( H ) & 2.2 \ ( B r ) & 2.8 \ hline end{tabular} ( B^{r} ) 1 ( O ) 3.5 If What is and On the basis of the electronegativity values given above, in which of the following are the bonds most polar? ( mathbf{A} cdot P H_{3} ) B. ( H_{2} O ) ( mathbf{c} cdot H B r ) D. ( P_{4} ) E ( . P B r_{3} ) |
11 |
567 | In Mendeleev’s Periodic Table, why was there no mention of Noble gases like Helium, Neon and Argon? |
11 |
568 | Where are the transition metals in the periodic table? A. In group o B. In group 1 c. In group 2 D. In a central block from 3-12 group number |
11 |
569 | Q. 24 Explain why the electron gain enthalpy of fluorine is less negative than that of chlorine? inthallen in loon noontive than that of Cl because when an electronis |
11 |
570 | The last element of lanthanide series is A. lawrencium B. lutetium c. cerium D. thorium |
11 |
571 | ( boldsymbol{C H} equiv boldsymbol{C H} ) is more electronegative as compared to ( C H_{2} equiv C H_{2} ) Explain. |
11 |
572 | The type of elements present in group ( 1[mid A] ) is: A . alkal B. alkaline c. transition D. halogen |
11 |
573 | Metal ( A ) has electronic configuration of 2,8,1 and metal ( B ) has electronic configuration of 2,8,2 Identify these metals: |
11 |
574 | The element which resembled cobalt, nickel and was placed in Newland’s table far away from those elements was: A. sodium B. calcium ( c . ) iron D. chlorine |
11 |
575 | Initially, it was believed that the atomic mass of beryllium was 13. But Mendeleev suggested that its atomic mass should be 9 i) Was Mendeleev suggestion correct? ii) How had he reached to this conclusion? |
11 |
576 | How many valence electrons are present in element Q? |
11 |
577 | Which forms the smallest of the +1 ions? A. Lithium B. Sodium c. Potassium D. Rubidium E. cesium |
11 |
578 | Which has maximum ionisation potential? A. ( N ) в. ( O ) ( c cdot O^{+} ) D. ( N a ) |
11 |
579 | ( E C ) of ( G d(64) ) is written as: A ( cdot[X e]_{54} 4 f^{7} 5 d^{1} 6 s^{2} ) В ( cdot[X e]_{54} 4 f^{8} 8 s^{2} ) ( mathbf{c} cdot[X e]_{54} 4 f^{9} 6 s^{1} ) D. ( [X e]_{54} 4 f^{10} ) |
11 |
580 | 14 comprehension given below is followed by some multiple choice questions. cach question has one correct option. Choose the correct option: the modern periodic table, elements are arranged in order of increasing atomic numbers which is related to the electronic configuration. Depending upon the type of orbitals receiving the last electron, the elements in the periodic table have been divided into four blocks, viz s, p, d and f. The modern periodic table consists of 7 periods and 18 groups. Each period begins with the filling of a new energy shell. In accordance with the Aufbau principle, the seven periods (1 to 7) have 2, 8, 8, 18, 18, 32 and 32 elements respectively. The seventh period is still incomplete. To avoid the periodic table being too long, the two series of f-block elements, called lanthanoids and actinoids are placed at the bottom of the main body of the periodic table (i) The element with atomic number 57 belongs to (a) s-block (b) p-block (c) d-block (d) f-block Ane to the olomont with atomic numhar 57 holona to d |
11 |
581 | Atomic wt. of ( C l=35.5 ) and of ( I=127 ) According to Doeberiner triad rule atomic wt. of ( boldsymbol{B r} ) will be: A . 80.0 B. 162.5 c. 81.25 D. 91.5 |
11 |
582 | Which of two elements among the following will display the most similar chemical properties? A. Aluminum and calcium B. Nickel and phosphorus c. chlorine and sulfur D. Carbon and sulfur E. Lithium and potassium |
11 |
583 | Element ‘X’ has twelve protons in its nucleus. To which group of the periodic table it will belong? ( A ) B. 2 ( c cdot 6 ) D. 8 |
11 |
584 | The correct order of ionization energies of ( boldsymbol{F}^{-}, boldsymbol{C l}^{-} boldsymbol{F} ) and ( boldsymbol{C l} ) is: A ( cdot C l<F<C l^{-}<F^{-} ) B . ( C l^{-}<F^{-}<C l<F ) c. ( F^{-}<C l^{-}<C l<F ) D. ( C l^{-}<C l<F^{-}<F ) |
11 |
585 | Q6. Write the atomic number of the element present in the third period and seventeenth group the periodic table. Ans. The element is chlorine (Cl) with atomic number (7) = 17. |
11 |
586 | Aluminium is diagonally related to A ( . L i ) B. ( S ) i ( c . B e ) D. ( B ) |
11 |
587 | The atomic number of an element ‘y’ is 20. The electronic configuration of the ion having inert gas configuration is: A .2,8,10 B. 2,18 c. 2,10,8 D. 2, 8, 8 |
11 |
588 | The number of valence electrons that can be present in the second element of any period is: A . 1 B . 2 ( c .5 ) D. 7 |
11 |
589 | Which of the following is the correct match? (a) Eka silicon – Ge (b) Eka aluminum – Ga (c) Eka manganese – Tr (d) Eka boron – Sc ( A cdot b, c ) B. a, b, d ( c cdot a, d ) D. All of above |
11 |
590 | Which of the given elements ( A, B, C, D ) and E with atomic number 2,3,7,10 and 30 respectively belong to the same period? ( A cdot A, B, C ) B. В, С, D c. А, D, ह D. B, D, E |
11 |
591 | Anomalous pair in Mendeleev’s periodic table is: A. ( L i, N a ) в. ( M g, ) Аl c. ( C o, N i ) D. ( B e, B ) |
11 |
592 | Among the elements ( C a, M g, P ) and ( C l ) the order of increasing atomic radii is: A. ( M g<C a<C l<P ) в. ( C l<P<M g<C a ) c. ( P<C l<C a<M g ) D. ( C a<M g<P<C l ) ( l ) |
11 |
593 | Which of the following is not the reason for the higher ( boldsymbol{E} boldsymbol{A}_{1} ) of halogens? I) High nuclear charge Il) Larger atomic size III) Easy to get octet configuration, i.e. ( boldsymbol{n} boldsymbol{s}^{2} boldsymbol{n} boldsymbol{p}^{6} ) IV) Half filled p-orbitals A. I and IV B. I, II and III c. Il and IV D. II and III |
11 |
594 | Electron gain enthalpy is positive when: A ( cdot O^{-} ) is formed from ( O ) B. ( O^{2-} ) is formed from ( O^{-} ) ( mathrm{c} cdot O^{+} ) is formed from ( O ) D. electron affinity is always a negative value |
11 |
595 | From the following which is the false statement for the long form of the periodic table? A. it reflects the sequence of filling the electrons in the order of sub-energy level s, p, d and f B. it helps to predict the stable valency states of the elements c. it reflects trends in physical and chemical properties of the elements D. it helps to predict the relative ionic nature of the bond between any two elements |
11 |
596 | The element with atomic number 9 resembles with the element having atomic number: ( A cdot 8 ) B. 17 ( c . ) 36 D. 27 |
11 |
597 | Assertion Newland’s law of octaves of elements is a function of their state that the property of every eighth element is the repetition of the first. Reason The maximum of 8 electrons can be accommodated in valence shell. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Assertion is incorrect but Reason is correct |
11 |
598 | Column- Column-II (Atomic number of elements) (IUPAC name) (A) 105 (P) Uun (В) 107 (Q) Uns (C) 109 (R) Unp (D) 110 (h) (S) Une The correct match for ( A, B, C, D ) are respectively: A ( . ) R, P, s, в. Р, R, s, c. R, Q, s, p D. Q, R, s, |
11 |
599 | An element ( X ) has 7 electrons in its shell. What is true about the element ( X ) ( ? ) This question has multiple correct options A. It belongs to period 9 of modern periodic table. B. Its atom contains 9 protons. C. It has a valency of 7 D. It can accept an electron to acquire noble gas configuration. |
11 |
600 | Which of the following has the highest electron affinity? A. ( F ) в. ( C l ) ( c . B r ) D. ( I ) |
11 |
601 | What is the total number of p electrons in a single phosphorus atom in its ground state? ( A cdot 3 ) B. 5 ( c .9 ) D. 15 |
11 |
602 | Sub-shell electronic configuration of elements ( P, Q ) and ( R ) is given ( [P, Q text { and } R text { are imaginary symbols }] ) ( P=1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{1} ) ( Q=1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{5} ) ( mathrm{R}=1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{2} 4 s^{2} 3 d^{1} ) (a) One of these electronic configurations given above is wrong. Which is the element? (b) Out of ( P, Q ) and ( R ) which has the highest electronegativity? (c) Can ( P ) and ( Q ) join to form an ionic compound? Justify your answer |
11 |
603 | What is the electronic configuration of the ground state of the magnesium cation, ( M g^{2+} ? ) A ( cdot 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} ) B ( cdot 1 s^{2} 2 s^{2} 2 p^{6} 3 s ) C ( cdot 1 s^{2} 2 s^{2} 2 p^{6} ) D. ( 1 s^{2} 2 s^{2} 2 p^{4} 3 s^{2} ) |
11 |
604 | In which of the following pairs, the first atom or ion is not larger than the second? A ( cdot F e^{2+}, F e^{3+} ) в. ( O, S ) c. ( N, O ) D. ( C l^{-}, C l ) |
11 |
605 | Beryllium and aluminium exhibit many properties which are similar. But, the two elements differ in: A. maximum covalency in compounds B. forming polymeric hydrides c. forming covalent halides D. exhibiting amphoteric nature in their oxides |
11 |
606 | The metal having highest ionisation potential is : A. lithium B. sodium c. potassium D. caesium |
11 |
607 | The liquid non-metal belongs to which group number? A . 15 B. 16 c. 17 D. 18 |
11 |
608 | In a group, basic nature from top to bottom. A. decreases B. increases c. constant D. none of these |
11 |
609 | 5. Among the following elements, which has the least electron affinity? (a) Phosphorous (b) Oxygen (C) Sulphur (d) Nitrogen |
11 |
610 | Explain Pauling’s scale of electronegativity. | 11 |
611 | Explain the appropriate reason for the following statement: (a)Size of ( M g^{2+} ) is less than Mg. (b) Electron gain enthalpy of Cl is more than that of F. |
11 |
612 | Difference in the number of protons of the largest element of the fourth period and the smallest element of the third period is: ( A ) B. 2 c. 20 D. 12 |
11 |
613 | 4th period in periodic table, ends with krypton. A . True B. False |
11 |
614 | An element is placed in the 2 nd group and 3 rd period of the periodic table, burns in presence of oxygen to form a basic oxide. The electronic configuration of the element is A. ( K, M, L(2,8,2) ) B. ( K, L, M(2,6,4) ) c. К, М, L (4,6,2) D. K,L, M (2,8, 2) |
11 |
615 | Two elements were elected by Mendeleev for studying the properties of compounds formed by other elements with the selected elements. What were the selected elements? A. Oxygen, Nitrogen B. Hydrogen, Carbon c. Hydrogen, Oxygen D. Oxygen, Carbon |
11 |
616 | In the Doberiener’s triad, all three elements have similar: A. electronic configuration B. properties c. number of shells D. both A and B |
11 |
617 | Which of the following is incorrect statement about Mendeleev’s classification of elements? A. He could classify all the elements including noble gases B. He left gaps for some yet to be discovered elements c. He predicted the properties of some undiscovered elements D. There was no place for isotopes in his table |
11 |
618 | An element with ( Z=46 ) belongs to : A. 9 group B. 10 group c. 11 group D. 12 group |
11 |
619 | There are no compounds of He and Ne. If true enter 1 , else enter 0 |
11 |
620 | ( P b^{4+} ) salts are better oxidizing agent agents, while ( G e^{2+} ) salts are better reducing agents. Explain. |
11 |
621 | The largest atom among the following is: A. sodium B. silicon c. potassium D. calcium |
11 |
622 | Element having atomic number 33 belongs to period: A . ( I I I ) в. ( I V ) ( c cdot V ) D. ( V I ) |
11 |
623 | The low electron affinity value of nitrogen is due to: A. small size B. high nuclear charge c. half-filled 2p subshell D. high metallic character |
11 |
624 | The properties which repeats repeatedly at a regular interval is called A. Diagonal properties B. Anomalous properties c. Periodic properties D. None |
11 |
625 | Which among the following is not an anomalous pair in Mendeleev’s periodic table? A . Co, Ni в. Te, c. Ar, ( k ) D. Sc, Ga |
11 |
626 | 4. What is the electronic configuration of the elements of group 14? (a) ns? np (b) nsnp (c) nsºnpº (d) ns2 |
11 |
627 | The eight group of Mendeleev’s periodic table is divided into how many subgroups? A .2 B. 0 ( c cdot 4 ) D. |
11 |
628 | Assertion According to Mendeleev, the properties of elements are a periodic function of their atomic weights. Reason Mendeleev left the gap under aluminium and a gap under silicon, and called these elements Eka-Aluminium and Eka-Silicon. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion C. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect |
11 |
629 | Which of the following is the correct order of chemical reactivity with water according to electrochemical series? A. ( K>M g>Z n>C u ) в. ( K>M g>C u>Z n ) c. ( C u>Z n>K>M g ) D. ( M g>K>C u>Z n ) |
11 |
630 | The outermost configuration of the least reactive element is: A ( cdot n s^{2} n p^{3} ) B . ( n s^{2} n p^{4} ) ( mathbf{c} cdot n s^{2} n p^{5} ) D. ( n s^{2} n p^{6} ) |
11 |
631 | 034. Which of the following statements related to the modern periodic table is incorrect? (a) The p-block has six columns, because a maximum of 6 electrons can occupy all the orbitals in a p-subshell (6) The d-block has 8 columns, because a maximum of 8 electrons can occupy all the orbitals in a d-subshell (c) Each block contains a number of columns equal to the number of electrons that can occupy that subshell. (d) The block indicates value of azimuthal quantum number (1) for the last subshell that received electrons in building up the electronic configuration. |
11 |
632 | The number of valence electrons across a period and down the group: A. increases, same B. decreases, same c. same, increases D. increase, decreases |
11 |
633 | Carbon belongs to second period and 14 group. Silicon belongs to third period and group 14. If atomic number of carbon is ( 6, ) the atomic number of silicon is : A. 7 B. 14 ( c cdot 24 ) D. 16 |
11 |
634 | Atomic number of a halogen element in the fourth period is ( 35 . ) If true enter 1 else enter 0 | 11 |
635 | Q. 47 Assertion (A) Boron has a smaller first ionisation enth beryllium. Reason (R) The penetration of 2s electron to the nucleus is more than the 2p electron hence 2p electron is more shielded by the inner core of electrons than the 2s electrons (a) Assertion and reason both are correct statements but reason is not correct explanation for assertion. (b) Assertion is correct statement but reason is wrong statement. (d Assertion and reason both are correct statements and reason is correct explanation for Assertion (d) Assertion and reason both are wrong statements. |
11 |
636 | Which of the following elements exhibit maximum outermost electrons? A . Na a в. Мв ( c cdot s i ) ( D ) |
11 |
637 | ‘ U. 10 11 30. The ionization energy of the ionized sodium atom Nal0+ (a) 13.6 eV (c) (13.6/11) eV (b) 13.6 x 11 eV (d) 13.6 x (112) eV |
11 |
638 | Which of the following set of elements cannot be a triad? A. ( L i, N a, K ) B. ( B, A l, G a ) c. ( B e, M g, C a ) D. ( C l, B r, I ) |
11 |
639 | In Mendeleev periodic table few elements that are chemically similar are placed in separate | 11 |
640 | were not given separate place in periodic table. A. Alkali metalss B. Isotopes c. Halogens D. Non-metals |
11 |
641 | A soft metal stored under kerosene is: A. sodium (Na) B. calcium(Ca) c. lithium (Li) D. magnesium (Mg) |
11 |
642 | Write the electronic configuration of the ( C a^{2+} ) in absence of Aufbau Principle. A ( cdot 1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{6} ) B ( cdot 1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{3} 3 p^{3} 4 d^{3} ) c. ( 1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{5} 4 d^{1} ) D. none of these |
11 |
643 | Which lists elements in order of increasing ionization energy? A ( . S<S^{+}<S^{-} ) B . ( S^{+}<S^{-}<S ) c. ( S^{-}<S<S^{+} ) D. ( S^{+}<S<S^{-} ) |
11 |
644 | The oxidation state of boron in potassium tetrafluoroborate is: ( A cdot+2 ) ( B cdot+3 ) ( c cdot+4 ) ( D cdot-3 ) |
11 |
645 | Which combination is odd with respect to oxidation number? ( mathbf{A} cdot H_{2} S O_{4}, H_{2} S_{2} O_{8}, K_{2} C r_{2} O_{7}, S F_{6} ) B. ( K_{2} C r_{2} O_{7}, K_{2} C r O_{4}, C r O_{5}, C r O_{2} C l_{2} ) ( mathbf{C} cdot N H_{3}, N H_{4}^{+}, N_{3} H, N O_{2}^{-} ) ( mathbf{D} cdot C a H_{2}, B a H_{2}, B e H_{2}, M g H_{2} ) |
11 |
646 | The atomic number of non transition element of ( 6 mathrm{d} ) series of ( ^{prime} d^{prime} ) block elements A . 112 B. 111 ( c .110 ) D. 80 |
11 |
647 | Second ionization enthalpy of Na is greater than that of Mg. A. True B. False |
11 |
648 | The electronic configuration of chloride ion is: ( mathbf{A} cdot 2,8,7 ) в. 2,8,6 c. 2,8,8 D. 2, |
11 |
649 | One element has atomic weight ( 39 . ) Its electronic configuration is ( 1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2}, 3 p^{6} 4 s^{1} . ) The true statement for that element is: A. more I.E B. transition element C. isotone with ( _{18} A r^{36} ) D. stable oxide ( M_{2} O ) |
11 |
650 | What are the electronic configuration of ( N a^{+} ) and ( C l^{-} ) ions? ( mathbf{A} cdot N a^{+}=2,8,2 ) and ( C l^{-}=2,8,7 ) B. ( N a^{+}=2,8 ) and ( C l^{-}=2,8,8 ) ( mathbf{C} cdot N a^{+}=2,8,2 ) and ( C l^{-}=2,8,6 ) D. ( N a^{+}=2,8 ) and ( C l^{-}=2,8,7 ) |
11 |
651 | Select in each pair, and one having lower ionization energy and explain the reason (a) ( I ) and ( I^{-} ) (b) ( B r ) and ( K ) (c) ( L i ) and ( boldsymbol{L} boldsymbol{i}^{+} ) (d) ( B a ) and ( S r ) (e) ( O ) and ( S ) (f) ( B e ) and ( B ) (g) ( N ) and ( O ) |
11 |
652 | Which of the following element is expected to have highest electron gain enthalpy: A ( cdot 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{5} ) B ( cdot 1 s^{2} 2 s^{2} 2 p^{3} ) c. ( 1 s^{2} 2 s^{2} 2 p^{4} ) D ( cdot 1 s^{2} 2 s^{2} 2 p^{5} ) |
11 |
653 | The electron configuration for potassium in the ground state: A ( cdot 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} ) B . ( 1 s^{2} 2 s^{2} p^{6} 3 s^{2} 3 p^{6} 4 s^{2} ) C ( cdot 1 s^{2} 2 s^{2} p^{6} 3 s^{2} 3 p^{6} 4 s^{1} ) D. ( 1 s^{2} ) E ( cdot 1 s^{2} 2 s^{2} 2 p^{6} 3 p^{1} ) |
11 |
654 | The oxidation state of an element in a particular compound can be defined as: A. the charge acquired by its atom on the basis of electronegative consideration from other atoms in the molecule B. the residual charge acquired by it s atom after removing all electronegative atoms from the molecule C. the valency of the most electronegative atom present in the molecule D. total number of electrons accepted by an atom to form a molecule |
11 |
655 | The correct order of ionisation energy of ( boldsymbol{C}, boldsymbol{N}, boldsymbol{O} & boldsymbol{F} ) is: A. ( F<N<C<O ) в. ( C<N<O<F ) c. ( C<O<N<F ) D. ( F<O<N<C ) |
11 |
656 | Among the following which one has largest atomic radius? A ( . C l ) в. ( F ) c. ( L i ) D. Ne E . ( N a ) |
11 |
657 | The numerical value of energy involved in the given process ( K rightarrow K^{-} ) is less than that of which of the following processes? ( mathbf{A} cdot K^{-} rightarrow K ) В. ( K rightarrow K^{+} ) c. Both (a) and (b) D. None of these |
11 |
658 | Which one is correct A. Oxidizing property along a period – Decreases. Down the group – Increases. Reducing property along a period – Decreases. Down the group – Increases B. Oxidizing property along a period – Increases. Down the group – Decreases. Reducing property along a period – Increases. Down the group – Decreases C. Oxidizing property along a period – Increases. Down the group – Increases. Reducing property along a period – Decreases. Down the group – Increases D. Oxidizing property along a period – Increases. Down the group – Decreases. Reducing property along a period – Decreases. Down the group – Increases |
11 |
659 | Q. 6 The statement that is not correct for periodic classification of elements is (a) The properties of elements are periodic function of their atomic numbers (b) Non-metallic elements are less in number than metallic elements (c) For transition elements, the 3d-orbitals are filled with electrons after 3p-orbitals and before 4s-orbitals (d) The first ionisation enthalpies of elements generally increase with increase in atomic number as we go along a period |
11 |
660 | A sudden large jump between the values of second and third ionization energies of an element would be associated with the electronic configuration of: A ( cdot 1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{1} ) B . ( 1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2}, 3 p^{1} ) C ( cdot 1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2}, 3 p^{2} ) D. ( 1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2} ) |
11 |
661 | The ionization potential of elements in any group decreases from top to bottom. This is due to: A. increase in the size of an atom B. increase in the atomic number c. increase in the screening effect D. both increase in the size of an atom and increase in the screening effect |
11 |
662 | What was Mendeleev’s basis of classification of elements? |
11 |
663 | Based on modern classification of periodic table atomic number increases on moving from in periodic table. A . left to right B. right to left c. straight D. none of these |
11 |
664 | The correct order of increasing atomic size of element ( N, F, S i & P ) is: ( mathbf{A} cdot N<F<S i<P ) B ( . F<N<P<S i ) ( mathbf{c} cdot F<N<S i<P ) D. ( N<S i<F<P ) |
11 |
665 | Who was the first to classify the elements into metals and non-metals? A. Meyer B. Mendeleev C. Lavoisier D. None of the above |
11 |
666 | The elements belonging to which group are called representative elements? This question has multiple correct options A. 1 and 2 B. 3 to 12 ( c .13 ) to 18 D. Element lying at the bottom of periodic table |
11 |
667 | Lanthanoids are also called as A. Transition elements B. Rare earth elements c. Both A and B D. None of these |
11 |
668 | Which of the following transitions involves maximum amount of energy? ( mathbf{A} cdot M_{(s)} rightarrow M_{(g)} ) ( mathbf{B} cdot M_{(g)} rightarrow M^{+}(g) ) ( mathbf{c} cdot M^{+}(g) rightarrow M^{2+}(g) ) D. ( M^{2+}(g) rightarrow M^{3+}(g) ) |
11 |
669 | The ionisation potential of isotopes of an element will be: A. same B. different c. dependent on atomic masses D. dependent on the number of neutrons present in the nucleus |
11 |
670 | Write the electronic configuration of ( boldsymbol{K} ) and ( N e ? ) |
11 |
671 | Which of the following statement(s) is incorrect ? A . lonisation energy ( propto frac{1}{text { Screening effect }} ) B. The first ionisation energies of Be and Mg are more than ionisation energies of B and Al respectively c. Atomic and ionic radii of Niobium and Tantalum are almost same D. Metallic and covalent radii of potassium are 2.03 , and 2.3 ( dot{A} ) respectively |
11 |
672 | Fifth period has elements. ( A cdot 18 ) B. 32 ( c cdot 26 ) D. 16 |
11 |
673 | Noble gases are stable because their valence shell contains: A . 2 electrons B. 8 electrons c. both ( A ) and ( B ) D. none of the above |
11 |
674 | An element has atomic number 79 Predict the group and period in which the element is placed. A. 2nd group, 7th period B. 11th group, 6th period C. 13th group, 6th period D. 12th group, 6th period |
11 |
675 | The atomic number of Uut is: ( A cdot 113 ) B. 114 ( c cdot 108 ) D. 115 |
11 |
676 | Identify the position of the elements having outer electronic configuration ( n s^{2} n p^{5} ) for ( n=3 ) A. 17 th group, 3rd period B. 8th group, sth period c. 7th group, 5th period D. 8th group, 4th period |
11 |
677 | Arrange the following ions in increasing order of their radius: ( mathbf{A} cdot M n^{+7}<V^{+5}<C a^{+2}<K^{+} C l^{-}<S^{2}<P^{3-} ) B ( cdot M n^{+7}<C a^{+2}<V^{+5}<K^{+} C l^{-}<S^{2}<P^{3-} ) ( mathbf{c} cdot M n^{+7}<V^{+5}<C a^{+2}<K^{+} C l^{-}<P^{3-}<S^{2} ) D. ( V^{+5}<M n^{+7}<C a^{+2}<K^{+} C l^{-}<S^{2}<P^{3-} ) |
11 |
678 | Assertion SnCl ( _{2} ) is a reducing agent. Reason SnCl ( _{2} ) reduces ( F e C l_{3} ) to ( F e C l_{2} ) and HgCl( _{2} ) to ( H g ) A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion C. Assertion is correct but Reason is incorrect D. Assertion is incorrect but Reason is correct |
11 |
679 | Which of the following will have highest nucleophilicity? ( mathbf{A} cdot boldsymbol{theta} ) ( C l ) B. ( theta ) ( F ) ( c . theta ) ( C H_{3} ) D. ( theta ) ( O H ) |
11 |
680 | The energy of an electron in the ( 1 s ) orbital of ( boldsymbol{H}^{-}, boldsymbol{H} e, boldsymbol{L} boldsymbol{i}^{+} ) and ( boldsymbol{B} boldsymbol{e}^{2+} ) follows the order. A ( . H^{-}>H e>L i^{+}>B e^{2} ) B . ( L i^{+}>B e^{2+}>H e>H^{-} ) ( mathbf{c} cdot B e^{2+}>L i^{+}>H e>H ) D. ( H^{-}>L i^{+}>H e>B e^{2} ) |
11 |
681 | The first element of a group in many ways differs from the other heavier members of the group. This is due to: This question has multiple correct options A. the smaller size B. the high electronegativity and high ionisation potential c. the unavailability of d-orbitals D. the higher shielding effect |
11 |
682 | The set representing the correct order of first ionisation potential is : A. ( K>N a>L i ) в. ( B e>M g>C a ) c. ( B>C>N ) D. ( G e>S i>C ) |
11 |
683 | Recently (in Aug 2003 ) two new elements have been discovered with atomic number: A .113,114 В. 114,115 ( mathrm{c} .115,116 ) D. 113,115 |
11 |
684 | When burned, sulfur forms a gaseous product ( X ) which can be oxidised to produce a gas ( Y . ) Gas Y reacts with water to produce a product Z. Which row correctly shows the oxidation states of sulfur in ( X, Y ) and ( Z ? ) begin{tabular}{ccccc} & ( mathbf{x} ) & ( mathbf{Y} ) & ( mathbf{z} ) \ ( mathbf{A} ) & -2 & +4 & +4 \ & & & \ ( mathrm{B} ) & -2 & +4 & +6 \ ( mathrm{C} ) & +4 & +6 & +4 \ & & & \ ( mathrm{D} ) & +4 & +6 & +6 \ hline end{tabular} ( A cdot A ) B. B ( c cdot c ) D. |
11 |
685 | possess the lowest first ionization energy in their respective period. A . Alkali metals B. Alkaline earth metals c. Noble gases D. Halogens |
11 |
686 | The electronic configurations of three elements ( X, Y ) and ( Z ) are 2,( 8 ; 2,8,7 ; ) and 2,8,2 respectively. Which of the following is correct? A. ( X ) is a metal B. ( Y ) is a metal ( c cdot Z ) is a non-metal D. ( Y ) is a non-metal and ( Z ) is a metal |
11 |
687 | In iron atom ( (z=26), ) the differentiating electron enters sublevel: A ( .4 d ) B. ( 3 d ) c. ( 4 p ) D. ( 5 p ) |
11 |
688 | Which of the following is(are) Dobereiner’s triads? (a) ( P, A s, S b ) (b) ( mathrm{Cu}, mathrm{Ag}, mathrm{Au} ) (c) ( mathrm{Fe}, mathrm{Co}, mathrm{Ni} ) ( (d) S, S e, T e ) ( A cdot ) a and ( b ) B. b and c ( c . ) a and d D. all of the above |
11 |
689 | Which of the following has highest second ionization energy? A . ( N i ) в. ( V ) ( c cdot C r ) D. ( M n ) |
11 |
690 | Which of the following atoms should have the highest 1st electron affinity? A. ( F ) B. ( O ) ( c . N ) D. ( C l ) |
11 |
691 | Use the following system of naming elements in which first alphabets of the digits are written collectively, 0 2 uni bi rri quad pent Write three-letter symbol for the elements with atomic number 106 A . un B. unh c. uunhe D. unhex |
11 |
692 | The gradual addition of electronic shells in the noble gases causes a decrease in their A. ionization energy B. atomic radius c. boiling point D. density |
11 |
693 | Which element is a metal with valency 2? |
11 |
694 | Q7. Which element do you think would have been named by (i) Lawrence Berkeley Laboratory (ii) Seaborg’s group? |
11 |
695 | The electronic configuration of an element is ( 1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2} . ) The oxidation number of the element in its compounds can be: ( A cdot+2 ) B. +8 ( c cdot+1 ) ( D ) |
11 |
696 | The elements of the group 16 are also called: A. helogens B. noble gases c. chalcogens D. alkaline earth metals |
11 |
697 | Valence shell electronic configuration of Barium is: ( A cdot 5 s^{2} ) B. ( 6 s^{2} ) ( c cdot 5 s ) D. ( 6 s^{text {। }} ) |
11 |
698 | The electronegativity order increases in the order: A. ( mathrm{C}, mathrm{N}, mathrm{Si}, mathrm{P} ) B. ( N, ) Si, ( C, P ) c. ( mathrm{si}, mathrm{P}, mathrm{C}, mathrm{N} ) D. ( P, ) Si, ( N, C ) |
11 |
699 | Which of the following corresponds to the configuration? ( 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} ) A. не B. Na a c. мg ( D cdot A ) |
11 |
700 | Which of the following elements are called representative elements? ( mathbf{A} cdot p ) block elements only B. ( s ) and ( p ) block elements only C. ( d ) block elements only D. ( s ) block elements only |
11 |
701 | Total number of possible shells in uranium atom is: (atomic no. ( z=92) ) A. 7 B. ( c cdot 6 ) D. none of these |
11 |
702 | An element has nine positive charges in its nucleus. Its common oxidation state is: ( A cdot+7 ) B. +5 ( c cdot-1 ) D. +1 |
11 |
703 | Two elements ( X ) and ( Y ) contain only one electron in the outer level. Element ( X ) is reactive and loses electron easily while element ( Y ) is relatively unreactive and non-corrosive. The elements ( boldsymbol{X} ) and ( boldsymbol{Y} ) respectively are: ( mathbf{A} cdot C s ) and ( L i ) B. ( R b ) and ( N a ) c. ( L i ) and ( C u ) D. ( A g ) and ( A u ) |
11 |
704 | lonization potential in a period is lowest for: A. halogens B. inert gases c. alkali metals D. alkaline earth elements |
11 |
705 | Eka – silicon is a : A. metal B. non-metal c. metalloid D. none of the above |
11 |
706 | As you go down in a group, the alkali metals become: A. brighter B. hotter c. more reactive D. less reactive |
11 |
707 | Which of the following is the property of a group? A. The elements in the same group have similar outer electronic configuration. B. Their atomic size increases on moving down the group C. Their melting and boiling points changes in a regular manner D. All of the above |
11 |
708 | Which of the following has ( 2^{n d} I P< ) ( 1^{s t} ) IP? A. ( M g ) в. ( N e ) ( c . c ) D. None |
11 |
709 | The element having the least number of electron shells is : A. ( L ) B. c. Na D. cs |
11 |
710 | The modern periodic table has been evolved through the early attempts of Dobereiner, Newland and Mendeleev. List one advantage and one limitation of all the three attempts. |
11 |
711 | Which is not correct in case of ( B e ) and ( A l ? ) A. Both are rendered passive by conc. ( H N O_{3} ) B. Carbides of both give methane on hydrolysis C. Both give hydroxides which are basic D. Both give covalent chlorides |
11 |
712 | Which of the following has largest radius? A ( cdot 1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2} ) B ( cdot 1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2}, 3 p^{1} ) C ( cdot 1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2}, 3 p^{3} ) D. ( 1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2}, 3 p^{5} ) |
11 |
713 | The elements with atomic numbers ( mathbf{9}, mathbf{1 7}, mathbf{3 5}, mathbf{5 3}, mathbf{8 5} ) are all : A . noble gases B. halogens c. heavy metals D. light metals |
11 |
714 | The number of completed transitional series in the periodic table is / are: A . 2 B. 3 ( c cdot 4 ) ( D ) |
11 |
715 | 2. 11 The formation of oxide ion 02- (g), from oxygen atom requires first an exothermic and then an endothermic step as shown below 0 (g) + 0- (g); AH = – 141 kJ mol-1 0 (g) + 02 (g); AH = + 780 kJ mol-1 Thus, process of formation of 02- in gas phase is unfavourable even though 02- is isoelectronic with neon. It is due to the fact that (a) oxygen is more electronegative (b) addition of electron in oxygen results in larger size of the ion (c) electron repulsion outweighs the stability gained by achieving noble gas configuration (d) Oion has comparatively smaller size than oxygen atom |
11 |
716 | If ( A, B ) and ( C ) are the three elements of Dobereiner’s triad, and atomic weights of ( A ) and ( B ) are 7 and ( 15, ) respectively then the atomic weight of ( C ) is : ( A cdot 1 ) B. 11 ( c cdot 23 ) D. 25 |
11 |
717 | Q10. What is screening or shielding effect? How does it influence the ionization enthalpy? ahalle chiold the electrons |
11 |
718 | No. of elements in 1st period are: ( A cdot 2 ) B. 6 ( c cdot 8 ) D. 18 |
11 |
719 | Which of the following is the most stable oxidation state of aluminium? A . -1 B. +1 ( c cdot+2 ) D. +3 |
11 |
720 | 037. Which of the following statements is incorrect in relation to ionization enthalpy! (a) ionization enthalpy increases for each successive electron. (b) The greatest increase in ionization enthalpy is experienced on removal of electrons from core noble gas configuration. (c) End of valence electrons is marked by a big jump in ionization enthalpy. (d) Removal of electron from orbitals bearing lower n value is easier than from orbital having higher n value. at |
11 |
721 | An element ( X ) has IE and EA respectively 275 and ( 1450 k J ) mole ( ^{-1} ). The electronegativity of element according to Mullikan scale is ? A . 2.4 в. 2.8 ( c .3 .20 ) ( D cdot 4.0 ) |
11 |
722 | The atomic numbers of Lanthanides are from: A 57 to 71 1 B. 90 to 103 ( c .21 ) to 30 D. 39 to 48 |
11 |
723 | Diagonal relationship is shown between: A. ( C ) and ( N ) B. ( B ) and ( M g ) c. ( B ) and ( S i ) D. ( B e ) and ( A l ) |
11 |
724 | Arrange the following in order of increasing reducing property. ( N a H, M g H_{2} ) and ( H_{2} O ) |
11 |
725 | An element has atomic number ( 16 . ) It will belong to which period of the periodic table? ( A cdot 2 ) B. 3 ( c cdot 4 ) D. 5 |
11 |
726 | Which amongst the following can lose 2 electrons to acquire the configuration of argon? A. ( N ) в. ( M g ) ( c . C a ) D. ( B e ) |
11 |
727 | The ionisation enthalpy of ( H e^{+} ) ion is ( 19.60 times 10^{-18} J ) atom ( ^{-1} . ) The ionisation enthalpy of ( L i^{2+} ) ion will be: A. ( 84.2 times 10^{-18} ) Jatom( ^{-1} ) B. ( 44.10 times 10^{-18} ) Jatom ( ^{-1} ) c. ( 63.20 times 10^{-18} ) Jatom ( ^{-1} ) D. ( 21.20 times 10^{-18} ) Jatom ( ^{-1} ) E ( .2 .17 times 10^{-19} mathrm{Jatom}^{-1} ) |
11 |
728 | What is the IUPAC name of an element with atomic number 107 |
11 |
729 | Which of the following species has same number of unpaired electrons? This question has multiple correct options A ( cdot C r^{3} ) B. ( M n^{2+} ) ( mathrm{c} cdot F e^{3} ) D. ( C u^{2} ) |
11 |
730 | A nuclide of an alkaline earth metal undergoes radioactive decay by emission of three ( alpha ) -particle in succession. The group of the periodic table to which the resulting daughter element would belong is A. Group 14 B. Group 16 c. Group 4 D. Group 6 |
11 |
731 | Which of the following elements position’s was not justified in Mendeleev’s periodic table? A. Hydrogen B. Lithium c. Sodium D. Potassium |
11 |
732 | Which element was not known when Mendeleev gave his classification? A. Germanium B. Gallium c. Scandium D. All of the above |
11 |
733 | Q. 40 How does the metallic and non-metallic character vary on moving from left to right in a period? |
11 |
734 | State Modern periodic law. | 11 |
735 | What is valency? Write valency of hydrogen. |
11 |
736 | ( N a, M g ) and ( A l ) are the elements of the ( 3^{r d} ) period of the Modern Periodic Table having group number 1,2 and 13 respectively. Which one of these elements has the (a) highest valency, (b) largest atomic radius, and (c) maximum chemical reactivity? Justify your answer starting the reason for each. |
11 |
737 | The ( X-X ) bond length is ( 1.00 dot{A} ) and ( C-C ) bond length is 1.54 A. If electronegativities of ‘ ( X^{prime} ) and ‘ ( C^{prime} ) are 3.0 and 2.0 respectively, the ( C-X ) bond length is likely to be: A. 1.27 an a в. 1.18 ( dot{A} ) c. ( 1.08 AA ) D. ( 1.28 dot{A} ) |
11 |
738 | Which one of the alkaline earth metals shows some anomalous behaviour and has same electronegativity as aluminium? A. sr в. са c. Ва D. Be |
11 |
739 | toppr Q Type your question virtually all or the transıtion metals form dipositive ( (2+) ) cations, along with one or more other forms. For example, titanium forms ( boldsymbol{T} boldsymbol{i}^{2+} ) ad ( boldsymbol{T} boldsymbol{i}^{4+}, ) and cobalt forms ( C o^{2+} ) and ( C o^{3+} ) The principal exceptions to this predominance of cations with a ( 2^{+} ) charge are scandium and yttrium, which form only tripositive cations. ( S c^{3+} ) and ( Y^{3+}, ) and copper and silver which form cations with a single positive charge. ( C u^{+} ) and ( A g^{+} ) [While copper also forms dipositive ( C u^{2+}, ) silver exhibits the single positive state essentially exclusively.] Which of the following offers a POSSIBLE explanation for the existence of ( C u^{+} ) and ( A g^{+} ? ) A. Mendeleev placed copper and silver in Group IB on his original periodic table because they formed compounds with the same combining ratios as elements in Group ( 1 A ) B. Elemental copper and silver have a single valence electron, which is lost in cation formation C. Copper and silver have higher ionization energies than the other transition metals in their respective periods, so are unable to lose more than one electron. D. The loss of one electron gives copper and silver noble gas configurations. |
11 |
740 | The name of the element having atomic number ( 100, ) was adopted in the honour of : A. Alfred Nobel B. Enrico Fermi c. Dmitri Mendeleev D. Albert Einstein |
11 |
741 | ( X ) is an element of the modern periodic table. It is surrounded by elements having the atomic numbers 17,34,36 and ( mathbf{5 3} ) (i) What is the atomic number of ( X ? ) (ii) Predict its position in the periodic table. (iii) Which among these do not belong to the same period? |
11 |
742 | Why was there no zero four in the original Mendeleefs Periodic Table? | 11 |
743 | Assertion Separation of lanthanides is very difficult. Reason Lanthanides differ only with electronic configuration in antipen ultimate shell. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion C. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect |
11 |
744 | Predict block, group and period of ( boldsymbol{S b} ) A. Block-p, Period- ( -5, ) Group- 15 B. Block-p, Period-5, Group-14 c. Block-s, Period- – 5 , Group- 13 D. Block- ( s ), Period-5, Group- 11 |
11 |
745 | Which of the following statements is not true about Dobereiner’s law of triads? A. The law was applicable to all known elements B. Nitrogen family does not obey the law of triads C. Dobereiner’s classification was not very useful D. The atomic mass of the central element of each triadd was merely the arithmetic mean of of the atomic masses of other two elements |
11 |
746 | The most electronegative element belongs to: A. group 1 B. group 18 c. group 17 D. group 15 |
11 |
747 | Which element has a dicey position in the modern periodic table? A. Hydrogen B. Helium c. Argon D. Neon |
11 |
748 | 5. An element X which occurs in the first short period has an outer electronic structure s2p1. What are the formula and acid-base character of its oxides? (a) X0z, basic (b) X,Oz, basic (c) X,0,, amphoteric (d) XO,, basic |
11 |
749 | Noble gases are placed extremely left in the periodic table. A . True B. False |
11 |
750 | Which atoms should have smaller value of ( (boldsymbol{I} boldsymbol{E})_{1} ? ) (a) Oxygen or sulphur (b) Nitrogen or phosphorus ( begin{array}{ll}text { A } cdot text { (a) } S(b) & Pend{array} ) B. (a) ( O ) (b) ( P ) c. (a) ( S ) (b) ( N ) D. Noneofthese |
11 |
751 | The group number, number of valence electrons, and valency of an element with the atomic number 15 respectively, of ( boldsymbol{P}, ) are: ( mathbf{A} cdot 16,5 ) and 2 B. 16,6 and 3 c. 15,5 andb 3 D. 15,6 and 2 |
11 |
752 | ( ln C u X_{2}, X ) belongs to which group? A. group IA B. group IIA c. group IIIA D. group VIA E. group VIIA |
11 |
753 | Describe the main features of Mendeleev’s Periodic Table. |
11 |
754 | In the second period, Li to Ne identify the element (a) Most reactive element (b) Most non-reactive non-metal (c) Largest atomic radius (d) With valency equal to 4 |
11 |
755 | The number of elements known in Mendeleev’s presented periodic table is: ( mathbf{A} cdot 50 ) B. 90 c. 63 D. 102 |
11 |
756 | 01 ( ) 20 Pu. Q25. Would you expect the first ionization enthalpies of two isotopes of the same element to be the same or different? Justify your answer. |
11 |
757 | Assertion ( H_{2} S ) is more acidic than ( H_{2} O ) Reason ( H-S ) bond is more polar than ( H-O ) bond. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion C. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect |
11 |
758 | Match the atomic number of the transuranium element (in List I) with their IUPAC representation in (List II). |
11 |
759 | In Mendeleev’s periodic table, gaps were left for the element to be discovered later on, which of the following elements found a place on the periodic table later on: A. germanium B. chlorine c. silicon D. oxygen |
11 |
760 | Which of the following acid is strongest? ( mathbf{A} cdot H F ) в. ( H_{2} ) 0 c. ( N H_{3} ) D. ( C H_{4} ) |
11 |
761 | In Mendeleev table, the triad of VIII group is : ( A cdot ) Ru, Rh, Pd B. Cu, Ag, Au c. ( N, ) О, ( F ) D. TI, Pb, Bi |
11 |
762 | Outermost shell cannot have more than electrons. A .2 B. 4 ( c cdot 6 ) ( D ) |
11 |
763 | Hydrolysis of urea is an example of A. Homogenious reaction B. heterogenious reaction C. Biomolecular reaction D. Both a and b |
11 |
764 | o seven du wu que 118. What element has the atom whose K, L, and M shells and 4s subshell are filled completely and 4p subshell is half-filled? |
11 |
765 | Column II give the group to which element in column I belong, match them correctly. |
11 |
766 | The properties of the elements, as well as the formulae and properties of their compounds depend in a periodic manner on the atomic weights of the elements. This periodic law was given by : A. J. Lothar Meyer B. John A. R. Newlands c. Dobernier D. D.I. Mendleev |
11 |
767 | Which among the following elements has the largest atomic radii? A. ( N a ) в. ( M g ) c. ( K ) D. ( C a ) |
11 |
768 | According to the Newlands’ law of octaves, the properties of fluorine are similar to those of A. hydrogen B. lithium c. sodium D. potassium |
11 |
769 | The law of triads was given by : A. Dobereiner B. Lewis c. Mendeleev D. Dalton |
11 |
770 | The correct order of atomic radii is : ( mathbf{A} cdot C e>S m>Y b>L u ) в. ( S m>C e>L u>Y b ) c. ( L u>Y b>S m>C e ) ( mathrm{D} cdot S m>Y b>C e>L u ) |
11 |
771 | In periodic table, the period number indicates the number of: A. neutrons B. protons c. electrons D. none of the above |
11 |
772 | The type of elements present in group 18[0] are : A . alkal B. alkaline c. transition D. noble gases |
11 |
773 | What is the valency of potassium with atomic number ( 19 ? ) ( mathbf{A} cdot mathbf{0} ) B. ( c cdot 2 ) ( D ) |
11 |
774 | Select correct statement(s): This question has multiple correct options A. ( C e, P r ) and ( N d ) are ( f ) -block elements B. ( C u, P d ) and ( N i ) are d-block elements ( mathbf{c} cdot C uleft([A r] 3 d^{10} 4 s^{1}right) ) and ( Kleft([A r] 4 s^{1}right) ) have been placed in sblock. D. ( S i, G e ) and ( A s ) are metalloids |
11 |
775 | The element eka-silicon predicted by Mendeleev is : A . Ge в. Ga ( c cdot A ) ( D cdot s ) |
11 |
776 | When ( L ) is heated with iron metal, it forms a compound ( F e L . ) What chemical term would you use to describe the change undergone by ( L ? ) |
11 |
777 | Which among the following elements has largest atomic size? ( A cdot B ) в. А। ( c cdot ) Ga D. In |
11 |
778 | Atomic size of ( N e>F e ) A. True B. False |
11 |
779 | Q38. Considering the elements B, AI, Mg and K. the correct order of their metallic character is: (a) B > Al > Mg > K (6) Al > Mg > B > K (c) Me > Al > K> B (d) K> Mg > Al > B |
11 |
780 | The arrangement of elements in a group of three is known as | 11 |
781 | Which of the following elements never show positive oxidation number? A. B. Fe ( c cdot ) Ga ( D ) |
11 |
782 | There are …….. periods in the Modern Periodic Table. A. 7 B. 18 ( c cdot 9 ) ( D ) |
11 |
783 | Consider the following statements. (I) Rutherford’s name was associated with the development of periodic table. (II) A metal M having electronic configuration ( 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{10} 4 s^{1} ) is d-block element. (III) Diamond is an element. (IV) The electronic configuration of the most electronegative element is ( 1 s^{2} 2 s^{2} 2 p^{5} ) The correct statements are: A. ।, ॥।, IV B. ।, ॥, ॥ा, IV c. ॥, IV D. I, III, IV |
11 |
784 | LS 650 Q18. What are the various factors due to which the ionization enthalpy of the main group elements tends to decrease down the group? |
11 |
785 | Which of the following will have maximum electron affinity? ( mathbf{A} cdot 1 s^{2} 2 s^{2} 2 p^{5} ) B ( cdot 1 s^{2} 2 s^{2} 2 p^{6} ) ( mathbf{C} cdot 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{5} ) D. ( 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} ) |
11 |
786 | The most electronegative element of period-3 is : A . ( A r ) B. ( S ) ( c cdot s i ) D. ( C l ) |
11 |
787 | At the time of Newlands, how many elements were known? ( mathbf{A} cdot 50 ) B. 52 c. 54 D. 56 |
11 |
788 | Upto which element, the law of octaves was applicable? A. oxygen B. Calcium c. cobalt D. Potassium |
11 |
789 | Pentavalence in phosphorus is more stable when compared to that of nitrogen even though they belong to same group is due to: A. reactivity of phosphorus B. inert nature of nitrogen c. hydrogen and sulphurous acid D. large size of phosphorus atom |
11 |
790 | 26 Identify the group and valency of the element having atomic number 119. Also predict the outermost electronic configuration and write the general formula of its oxide. |
11 |
791 | Which of the following reasons corresponds to decrease in IP value from top to bottom in a group? A. Decrease in screening effect B. Increase in atomic number c. Increase in screening effect D. Decrease in nuclear charge |
11 |
792 | State the electronic configuration for Boron ( [p=5, n=6] ) A . 2,3 B. 5, 10 c. 5,12 D. 5,1 |
11 |
793 | Law of octaves stated: A. every eighth element had properties similar to the first element B. every third element had properties similar to the first element C. the properties of the middle element were in between the other two members D. the properties of the elements were repeated after regular intervals of 3,4 or 8 elements |
11 |
794 | Let us suppose that you have discovered a new element of the atomic number ( 162, ) which you choose to name khalidium (Kh). Assume that the normal order of filling of orbitals still prevails in the eighth period. The new type of orbital used in Kh that |
11 |
795 | The pair with minimum difference in electronegativity is A . F, C в. с, н c. ( P, H ) D. Na, cs |
11 |
796 | The amount of energy when a million atoms of iodine are completely converted into ( I^{-} ) ions in the vapor state according to the equation, ( boldsymbol{I}_{(g)}+boldsymbol{e}^{-} rightarrow boldsymbol{I}_{(g)}^{-} ) is ( 4.9 times 10^{-13} mathrm{J} . ) What would be the electron gain enthalpy of iodine in terms of ( k J ) mol ( ^{-1} ) and ( e V ) per atom? ( mathbf{A} cdot 295,3.06 ) в. -295,-3.06 C .439,5.09 D. -356,-7.08 |
11 |
797 | ( P b O_{2} ) is a reducing agent. A. True B. False |
11 |
798 | Which of the following element would lose an electron easily? ( mathbf{A} cdot M g ) в. ( N a ) c. ( K ) D. ( C a ) |
11 |
799 | In ( S ) and ( P ) -block elements the oxidation state changes by 2 units. But in transition elements, it changes by 1 unit of 1. Explain. |
11 |
800 | Atomic wt. of ( P ) is 31 and ( S b ) is 120 . What will be the atomic wt. of As, as per Dobernier triad rule? A . 151 B. 75.5 c. 89.5 D. Unpredictable |
11 |
801 | The structure of sodium atom is shown in the figure given above. Identify the correct statement. An atomic sodium ( A . ) is a non-metal B. reacts vigorously with wate ( c . ) is stored in oil to avoid contact with moisture D. all of the above |
11 |
802 | Which of the following statement(s) is/are correct about the modern periodic table? This question has multiple correct options |
11 |
803 | The group number of element with atomic number 7 in the periodic table is: ( A cdot 2 ) B. 18 c. 15 D. 14 |
11 |
804 | State Dobereiner’s Triads giving one example. |
11 |
805 | The first I.P. values in electron volts of nitrogen and oxygen atoms are respectively given by : A ( .14 .6,13.6 ) в. 13.6,14.6 c. 13.6,13.6 D. 14.6,14.6 |
11 |
806 | Q30. Assign the position of the element having outer electronic configuration, (1) ns np for n = 3 (ii) (n-1) {ns for n = 4 and (iii) (n -2) f (1 – 1) dns for n = 6 in the periodic table? |
11 |
807 | Choose the option which describes best this statement: “The modern periodic table is based upon”. A. Atomic mass of the elements B. Number of neutrons in the nucleus c. Number of isotopes of an element D. Oxidation states E. Number of protons in the nucleus |
11 |
808 | Assertion Li and ( M g ) shows diagonal relationship. Reason Li and ( M g ) are diagonal to each other in the Periodic table. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Assertion is incorrect but Reason is correct |
11 |
809 | Pauling scale Linus Pauling: Phenomenon of electronegativity Relative electronegativities of two atoms in a molecule ( boldsymbol{E} boldsymbol{N}(boldsymbol{X})-boldsymbol{E} boldsymbol{N}(boldsymbol{Y})=mathbf{0 . 1 0 2}(triangle mathbf{1} / 2) . mathbf{1} ) 0.02 is conversion factor between ( k J ) and eV is: |
11 |
810 | Which of the following is non-existing? A. ( mathrm{H}_{2} ) в. ( mathrm{O}_{2} ) c. ( mathrm{N}_{2} ) D. He ( _{2} ) |
11 |
811 | Phosphorus has oxidation state of +3 in: A. phosphorus acid B. orthophosphoric acid c. metaphosphoric acid D. pyrophosphoric acid |
11 |
812 | The elements in the middle of the periodic table are called: A. metalloids B. transition elements c. rare earth element D. noble gases |
11 |
813 | What relation about elements did Dobereiner want to establish? |
11 |
814 | In terms of energy 1 u is equal to? begin{tabular}{l} A. ( 100 J ) \ hline end{tabular} B. ( 931.1 k c a l ) c. ( 931.1 mathrm{MeV} ) D. ( 10^{7} ) erg |
11 |
815 | Which among the following elements is metalloid? A. Berellium B. Barium c. Boron D. Bismuth |
11 |
816 | Which of the following elements is oxidised by fluorine and not by chlorine? A. Sodium B. Aluminum c. sulphur D. oxygen |
11 |
817 | The correct order of variation in the sizes of atoms is: A. ( B e>C>F>N e ) в. ( N e>F>C>B e ) c. ( N e>B e>C>F ) D. ( F>N e>B e>C ) |
11 |
818 | sily as compared to Q6. Explain why chlorine can be converted into chloride ion more easily as com ion from fluorine? Ans. Flectron main anth Chi more negative than that of |
11 |
819 | Total number of inert gases among the following is : ( mathrm{H}, mathrm{He}, mathrm{Ne}, mathrm{F}, mathrm{Ar}, mathrm{Kr}, mathrm{K} ) A . 1 B. 2 ( c cdot 3 ) D. 4 |
11 |
820 | State any three demerits of Mendeleev’s periodic table. |
11 |
821 | Considering the elements ( F, C I, O ) and ( N ) the correct order of their chemical reactivity in terms of oxidizing property is: ( (a) F>C mid>0>N ) ( (b) F>0>C l>N ) ( (c) C mid>F>0>N ) ( (d) O>F>N>C l ) |
11 |
822 | 06. An anion A*has 18 electrons. Write the atomic number of A. | 11 |
823 | The effective nuclear charge for the outermost electron of oxygen atom is A . 4.55 B. 5.35 ( c cdot 6.68 ) D. None of these |
11 |
824 | Question 6. Why is the highest oxidation state of a metal exhibited in its oxide or fluoride only? Consider high electronegativity of Fand O. |
11 |
825 | Choose the incorrect statement about effective nuclear charge. A. ( Z_{e f f}=Z-sigma(sigma text { is Slater’s screening constant }) ) B. ( Z_{text {eff}} ) increases as we move across the period C. ( Z_{text {eff}} ) decreases from top to bottom in a group D. ( Z_{text {eff}} ) is constant or almost constant for f-block elements |
11 |
826 | Assertion Compounds of ( boldsymbol{H} boldsymbol{g}^{2+} ) ions having an ionic radius of 116 pm are more covalent in character than those of ( C a^{2+} ) ions with almost identical size ( 114 p m) ) and the same charge. Reason For two ions of the same size and charge, one with an ( (boldsymbol{n}-mathbf{1}) boldsymbol{d}^{10} boldsymbol{n s}^{mathbf{0}} ) electronic configuration will be more polarizing than a cation with an ( (n- ) 1) ( s^{2}(n-1) p^{6} n s^{0} ) electronic configuration. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion. B. Both Assertion and Reason are correct, but Reason is not the correct explanation for Assertion. C. Assertion is correct, but Reason is incorrect D. Assertion is incorrect, but Reason is correct. |
11 |
827 | The Russian chemist Dmitri Mendeleev is generally credited with organizing the chemical elements into a comprehensive periodic table in large part due to the fact that he was able to use his table to predict the existence of elements, like gallium, that were not known at the time ( (1872), ) but were discovered later. Which is the best explanation for why Mendeleev was unable to predict the existence of the noble gases (group 18 |
11 |
828 | In ground state, all the elements of group 13 of the periodic table are having same number of : A . nuclear particles B. occupied principal energy levels c. electrons D. valence electrons E . neutrons |
11 |
829 | ( (I E)_{1} ) of Be is greater than that of B but ( (I E)_{2} ) of ( (B) ) is greater than that of Be.If true enter 1 , else 0 . |
11 |
830 | Which element has the symbol ( S b ? ) A. Arsenic B. Antimony c. Lead D. Seaborgium E. Silver |
11 |
831 | When ammonium vanadate is heated with oxalic acid solution, a substance ( mathbf{Z} ) is formed. A sample of Z was treated with ( K M n O_{4} ) solution in hot acidic solution. The resulting liquid was reduced with ( S O_{2}, ) the excess ( S O_{2} ) boiled off and the liquid again titrated with same ( K M n O_{4} . ) The ratio of volumes of ( K M n O_{4} ) used in the two titrations was ( 5: 1 . ) What is the oxidation state of vanadium in substance Z? Given than ( K M n O_{4} ) oxidize all oxidation state of vanadium to vanadium (+5) and ( S O_{2} ) reduces ( V(+5) ) to ( V(+4) ) |
11 |
832 | Which of the following statement is correct? This question has multiple correct options A . oxidizing power order: ( operatorname{SiCl}_{4}<operatorname{SnCl}_{4} R b B r>K B r>N a B r>L i B r ) |
11 |
833 | Isobars have same mass numbers becausetheir nuclei contain equalnumber of A. protons B. electrons c. neutrons D. nucleons |
11 |
834 | The correct order of stability of ( boldsymbol{A l}^{+}, boldsymbol{A l}^{+mathbf{2}}, boldsymbol{A l}^{+mathbf{3}} mathbf{i s} ) A ( cdot A l^{+3}>A l^{+2}>A l^{+} ) B. ( A l^{+2}>A l^{+3}>A l^{+} ) c. ( A l^{+2}A l^{+} ) D. ( A l^{+3}>A l^{+}>A l^{+} ) |
11 |
835 | 7. Which of the following atoms has the lowest ionisation potential? (a) 0 (b) 4N (c) 133 Cs too lonit (d) to Ar (AIEEE 2003) |
11 |
836 | ( 2^{n} d ) separation energy of an electron in H atom? A. 27.2 ev B. 1.51 ev c. 3.4 ev D. 13.6 ev |
11 |
837 | ( c ) Using the information ab bove, complete the following Metal atoms tend to have a maximum |
11 |
838 | The number of elements in each of the inner transition series is : ( A cdot 2 ) B. 8 c. 10 ( D cdot 14 ) |
11 |
839 | Refer to the Periodic table and identify the halogen element in the fifth period among following. A . ( I ) в. ( C l ) ( c . B r ) D. None of these |
11 |
840 | In the Modern Periodic Table, calcium (atomic number 20 ) is surrounded by elements with atomic numbers 12,19,21 and ( 38 . ) Which of these have physical and chemical properties resembling calcium? |
11 |
841 | Find the ratio of the following: ( (operatorname{Max}(mathrm{M}) ) ( +operatorname{Max}(mathrm{N})) /(operatorname{Max}(mathrm{K})+operatorname{Max}(mathrm{L})) ) where Max denotes the maximum number of electrons. ( K, L, M, N ) represent the shells. A . 4 B. 5 ( c .6 ) ( D .7 ) |
11 |
842 | Arrange the following elements in increasing order of their atomic radii ( boldsymbol{L} boldsymbol{i}, boldsymbol{B} boldsymbol{e}, boldsymbol{F}, boldsymbol{N} ) A. ( N<F<B e<L i ) B. ( F<N<L i<B e ) c. ( F<B e<N<L i ) D. ( F<N<B e<L i ) |
11 |
843 | List the different scales of electronegativity and briefly describe the theoretical basis behind each. |
11 |
844 | In the given square ( P, Q, R, S ) with atomic number is written are metalloids. About this the 4 statements are given below. Select the correct option of the true statements. (a) Element after square ( P ) is a non- metal (b) Square ( R ) represents metalloid (c) Element just before square ( R ) is a metalloid ( (d) ) Element just before square ( S ) is a non-metal ( A cdot(a),(b) ) and ( (c) ) в. ( (a),(b) ) and ( (d) ) c. ( (b) ) and ( (c) ) D. ( (a),(b),(c) ) and ( (d) ) |
11 |
845 | Increase in nuclear charge of an atom decreases the tendency of the atom to loose electrons. A. True B. False |
11 |
846 | An element has atomic number 19 Where would you expect this element in the periodic table and why? |
11 |
847 | M(g) + I.E. → M (g) + e 013. The electronic configuration of an element is 1s 2s 2p 3s 3p 4s”. Locate the element in the periodic table. |
11 |
848 | What would be the IUPAC name of element with a atomic number ( 120 ? ) A. Unbinilium B. Unnilhexium c. Unnilseptium D. Ununnilium |
11 |
849 | In a period, elements are arranged strictly in a sequence of: A. decreasing charge in the nucleus B. increasing charge in the nucleus C. constant charge in the nucleus D. equal charge in the nucleus |
11 |
850 | In which of the following period a maximum number of 32 elements are present? This question has multiple correct options ( mathbf{A} cdot 4^{t h} ) B. ( 6^{text {th }} ) ( c cdot 3^{r d} ) D. ( 7^{t h} ) |
11 |
851 | S-block elements are: A. Elements of group I-A and III-B. B. Elements of group I-A and II-A. C. Elements of group I-A and I-B. D. Elements of group I-A and II-B. |
11 |
852 | Q. 30 Choose the correct order of atomic radii of fluorine and neon (in pm) out of the options given below and justify your answer. (a) 72,160 (b) 160, 160 (c) 72, 72 (d) 160, 72 |
11 |
853 | An element M belongs to the group 1 and period 3 of the modern periodic table. Out of the following statement, which is the true about ‘M’? A. It forms an acidic oxide having formula ( M_{2} O_{3} ) B. It is a non-metal c. It is highly electro positive in nature D. It has a valency of three |
11 |
854 | Which element among those listed below, has the greatest electronegativity? A . In B. ( I ) c. ( S b ) D. ( T e ) E . ( S n ) |
11 |
855 | Boron is diagonally related to: A. boron B. aluminium c. magnesium D. silicon |
11 |
856 | Transition elements are also known as ( mathbf{A} cdot d- ) block elements B. ( f ) – block elements c. ( s ) – block elements D. None of these |
11 |
857 | Which group element has greater tendency to form positive ions than elements of group IIA? A . IA B. IVA ( c cdot v B ) D. None of these |
11 |
858 | Write the correct alternatives: According to Mendeleev’s periodic law, properties of elements are periodic function of their. A. Atomic number B. Atomic masses c. Densities D. Boiling points |
11 |
859 | Three elements ( A, B ) and ( C ) belong to the same group of the modern periodic table such that the difference in atomic weight of ( A ) and ( B ) is equal to the difference in atomic weight of ( B ) and ( C ) The sum of atomic weights of elements ( A ) and ( C ) is 46 and that of ( A ) and ( B ) is 30 Identify elements ( A, B ) and ( C . ) |
11 |
860 | State Newlands law of Octaves. | 11 |
861 | Q. 22 Ionic radii vary in (a) inverse proportion to the effective nuclear charge (b) inverse proportion to the square of effective nuclear charge (c) direct proportion to the screening effect (d) direct proportion to the square of screening effect |
11 |
862 | Electro negativity is expressed in Scale. A. paulings B. sorensens c. rutherford D. none of these |
11 |
863 | Energy required for the ionisation reactions are shown: ( boldsymbol{N a}(boldsymbol{g}) stackrel{+E_{1}}{rightarrow} boldsymbol{N} boldsymbol{a}^{+}(boldsymbol{g}) ) ( M g(g) stackrel{+E_{2}}{rightarrow} M g^{+}(g) ) and ( boldsymbol{N} boldsymbol{a}^{+}(boldsymbol{g}) stackrel{+boldsymbol{E}_{3}}{rightarrow} boldsymbol{N} boldsymbol{a}^{2+}(boldsymbol{g}) ) Then the correct order of absorbed energy is : A. ( E_{1}>E_{2}>E_{3} ) в. ( E_{3}>E_{1}>E_{2} ) c. ( E_{2}>E_{3}>E_{1} ) D. ( E_{3}>E_{2}>E_{1} ) |
11 |
864 | Example of noble gas is A. Helium B. Argon c. xenon D. all of these |
11 |
865 | The horizontal rows in Mendleev’s table were called : A. groups B. rows c. periods D. none of the above |
11 |
866 | After the classification of elements study of elements become A. difficult B. easy c. both ( A ) and ( B ) D. None of these |
11 |
867 | Equivalent weight of ( B r_{2} ) is 96 in the following disproportionation reaction: ( boldsymbol{B} boldsymbol{r}_{2}+boldsymbol{O} boldsymbol{H}^{-} rightarrow boldsymbol{B} boldsymbol{r}^{-}+boldsymbol{H}_{2} boldsymbol{O}+? ) (oxidized product) The oxidation state of Br in the oxidized product is ( (mathrm{Br}=80) ) |
11 |
868 | The first periodic law stated by Mendeleev was: A. there is no correlation in the properties and atomic weights of the elements B. the properties of the elements are a periodic function of their atomic numbers C. the properties of the elements are a periodic function of their atomic weights D. the properties of the elements are a periodic function of their empirical formula |
11 |
869 | An ion is an atom with an electric charge due to a loss or gain of an electron. Which of the following is the electron configuration of a ground state of the most common alkali metal ion? ( mathbf{A} cdot 1 s^{2} 2 s^{2} ) B. ( 1 s^{2} 2 s^{text {। }} ) C ( cdot 1 s^{2} 2 s^{2} 2 p^{6} ) D. ( 1 s^{2} 2 s^{2} 2 p^{6} s s^{2} 3 p^{6} 3 d ) |
11 |
870 | Consider the following statements and arrange in the order of true/false as given in the codes. ( S_{1}: ) Long form of periodic table completely helps in predicting the oxidation state of elements. ( S_{2}: ) Metallic and covalent radii of potassium are 203 pm and 230 pm respectively. ( boldsymbol{S}_{3}: ) Formation of ( boldsymbol{S} boldsymbol{e}^{2-} ) and ( boldsymbol{A} boldsymbol{r}^{-}, ) both the absorption of energy. A . FFT в. गाग c. ( pi mathrm{F} ) D. TFT |
11 |
871 | Assertion Formal charges help in selection of the lowest energy structure from a number of possible lewis structure. Reason show +1 formal charge on central 0 marked 1. A. Both Assertion and Reason are true and Reason is the correct explanation for Assertion B. Both Assertion and Reason are true but Reason is not the correct explanation for Assertion c. Assertion is true statement but Reason is false D. Both Assertion and Reason are false statement. |
11 |
872 | Which will have graded property particular to ( boldsymbol{E} cdot boldsymbol{C} cdot boldsymbol{1} boldsymbol{s}^{2} boldsymbol{2} boldsymbol{s}^{2} boldsymbol{2} boldsymbol{p}^{6} boldsymbol{3} boldsymbol{s}^{2} boldsymbol{3} boldsymbol{p}^{boldsymbol{6}} boldsymbol{4} boldsymbol{s}^{1} ) ? ( mathbf{A} cdot[A r] 3 d^{10} 4 s^{1} ) B . ( [K r] 4 d^{10} 5 s^{1} ) c. ( [K r] 5 s^{1} ) D. all of these |
11 |
873 | The ionization enthalpies, ( (I E)_{1} ) and the ( (I E)_{2} ) in ( mathrm{kJ} mathrm{mol}^{-1} ) of a few elements designated by Roman numerals are shown below: ( begin{array}{lll}text { Element } & (I E)_{1} & (I E)_{2} \ text { A } & text { 2372 } & 5251 \ text { B } & 520 & 7300 \ text { c } & 900 & text { 1760 } \ text { D } & text { 1680 } & text { 3380 }end{array} ) Which of the above elements form a stable binary halide of the formula [ boldsymbol{M} boldsymbol{X}_{2} ? ] A. ( A ) в. ( B ) c. ( C ) D. ( D ) |
11 |
874 | Who is the founder of the law of triads? | 11 |
875 | Which of the following general electronic configuration for transition elements is NOT correct? This question has multiple correct options A ( cdot(n+1) s^{1-2} n d^{1-30} ) B . ( left.n s^{1-2}(n-1) d^{1-10} text { (Where } n=2,3,4, ldots ldotsright) ) C. ( n s^{1-2}(n-1) s^{2} p^{6} d^{1-10} ) D ( cdot(n-1) d^{1-10} n s^{0-2} ) |
11 |
876 | The group number of the element with atomic number 37 is: |
11 |
877 | Which of the following elements have the lowest value of ( I E_{1} ? ) A ( . P b ) в. ( S n ) ( c . s i ) D. ( C ) |
11 |
878 | An element X has 7 electrons in its shell. What is true about the element ( x ) ( ? ) I. It belongs to period 9 of modern periodic table. II. Its atom contains 9 protons. III. It has a valency of 1 IV. Its atoms can accept an electron to acquire noble gas configuration. ( A cdot(1) ) and (11) B. (II), (III), (IV) c. (III) and (IV) D. (II) and (IV) |
11 |
879 | In Mendeleev’s periodic table, the elements were arranged in the increasing order of their atomic masses. However, cobalt with atomic mass of 58.93 amu was placed before nickel having an atomic mass of 58.69 amu. Reason for the same is that: A. the elements with similar size can be grouped togethe B. the elements with different properties can be grouped together c. the elements with similar properties can not be grouped together D. the elements with similar properties can be grouped together |
11 |
880 | Q3. Give reasons: sodium is lower than that of magnesium whereas IE, of sodium is higher than that of magnesium. (ii) Noble gases have positive value of electron gain enthalpy. that of sodium. For these |
11 |
881 | Which group elements of the modern periodic table were placed along with alkali metals in Mendeleeff table? ( A cdot 1 B ) B. ॥ в ( c cdot | A ) D. IA |
11 |
882 | Arrange the following in the ilncreasing hydrated ion size: ( boldsymbol{C} boldsymbol{s}_{boldsymbol{a q}}^{+}<boldsymbol{R} boldsymbol{b}_{boldsymbol{a q}}^{+}< ) ( boldsymbol{K}_{a q}^{+}<boldsymbol{N} boldsymbol{a}_{a q}^{+} ) If true enter 1 , else enter 0 . ( A ) |
11 |
883 | Complete the electronic configuration of a chloride ion. ( mathbf{1} s^{2} ) |
11 |
884 | If an element ( X ) is placed in group ( 14, ) the formula its chloride is: A. ( X C l ) в. ( X C l_{2} ) c. ( x C l_{3} ) D. ( X C l_{4} ) |
11 |
885 | The electronic configuration, ( 1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{6}, 3 d^{9} ) represents a A. Metal atoms B. non metals atom c. non-metallic anionic D. metallic cation |
11 |
886 | The second I.P. for alkali metals shows a jump while the third I.P. for alkaline earth metal shows a jump. Explain. |
11 |
887 | Which element has the symbol Ti? A. Tin B. Leadd c. Titanium D. Thallium E. Technetium |
11 |
888 | For the properties mentioned, the correct trend for the different species is : A. inert pair effect – ( A l>G a>I n ) B. first ionization enthalpy ( -B>A l>T l ) C . strength as Lewis acid – ( B C l_{3}>A l C l_{3}>G a C l_{3} ) D. oxidising property ( -A l^{+3}>I n^{+3}>T l^{+3} ) |
11 |
889 | SUSO Q. 23 An element belongs to 3rd period and group 13 of the Which of the following properties will be shown by the element? (a) Good conductor of electricity (b) Liquid, metallic (c) Solid, metallic (d) Solid, non-metallic |
11 |
890 | Q. 43 Match the correct atomic radius with the element. Element Atomic radius (pm) 74 Be 88 111 OZ Thinking Process |
11 |
891 | An atom with an electron configuration of ( 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{4} ) will probably exhibit an oxidation state of: ( A cdot+2 ) в. -2 ( c cdot+3 ) D. – ( E cdot+5 ) |
11 |
892 | Which element has the highest electronegativity? A. ( K ) в. ( C a ) c. ( B r ) D. ( K r ) E. ( Z n ) |
11 |
893 | POUC TUICUUILUL LUI QUUUC LLLLEEN Q2. Why is ionization enthalpy of nitrogen greater than that of oxygen |
11 |
894 | The energy needed to remove one electron from unipositive ion is abbreviated as: ( mathbf{A} cdot 1^{s t} I cdot P ) B. ( 3^{r d} ) I.P. ( mathbf{c} cdot 2^{n d} I . P ) D. ( 1^{s t} ) E.A. |
11 |
895 | The valency of element with atomic number 10 is: A . 0 B. ( c cdot 2 ) ( D ) |
11 |
896 | How does ionization enthalpy vary in a group and a period? | 11 |
897 | The atomicity of a noble gas is: ( A cdot 2 ) B. ( c cdot 0 ) D. |
11 |
898 | The diagram represents an atom ‘X! Answer the following. Atom ‘X’ will lose electrons to become |
11 |
899 | The element ( X ) with electronic configuration 2,8,8,2 belongs to A ( cdot 2^{n d} ) Period B. ( 3^{r d} ) Period ( mathbf{c} cdot 4^{t h} ) Period D. ( 5^{text {th}} )period |
11 |
900 | In Period 3 of the Periodic Table, element B is placed to the left of element A. On the basis of this information, choose the correct word from the brackets of complete the following statement. (i) The element B would have(lower/higher) metallic character than ( A ) (ii) The element A would probably have(lesser/higher) electron affinity than B. (iii) The element A would have(greater/smaller) atomic size than B. |
11 |
901 | Assuming that 113 elements are there in the periodic table now, what would be the group and period to which newly added element belongs? A. IVA group, 7th period. B. VIA group, 7th period. c. va group, 7th period. D. VIIA group, 6th period. |
11 |
902 | The breaking of which of the following bond is most endothermic? A ( . F-F ) в. ( C l- ) Сl c. ( B r-B r ) ( mathbf{D} cdot I-I ) |
11 |
903 | 0. 16 Which of the following sequences contain atomic numbers of only representative elements? (a) 3, 33, 53, 87 (b) 2, 10, 22, 36 (c) 7, 17, 25, 37, 48 (d) 9, 35, 51, 88 |
11 |
904 | What type of bond is formed, if the atoms involved has electronegativity difference as ( 2 ? ) A. Metallic B. Covalent c. lonic D. Polar covalent E. Hydrogen bonding |
11 |
905 | A paste of substance ( A ) is used to decorate the ceiling of your home. Write the reaction of substance ( A ) with ( boldsymbol{H}_{2} boldsymbol{O} ) |
11 |
906 | Arrange the following in the increasing strength: ( S<C l<N<O<F ) if true enter 1 , else enter 0 . |
11 |
907 | In the long form of periodic table, elements are arranged in the increasing order of : A. atomic mass B. atomic number C. mass number D. metallic character. |
11 |
908 | Which group elements are the most reactive among the non-metals? A . 15 th B. 16th c. 17 th D. 18th |
11 |
909 | What were the limitations of Newlands’ classification? A. It was applicable only for lighter elements B. He adjusted two elements on the same place C. The pattern was only observed up to calcium D. All of the above |
11 |
910 | Which of the following statements are correct? A. The second ionization enthalpy of oxygen element is greater than that of the fluorine element. B. The first ionization enthalpy of phosphorus is greater than that of aluminium. C. The first ionization enthalpy of aluminum is slightly greater than that of gallium. D. The first ionization enthalpy of ( B ) is less than that of Be. |
11 |
911 | When you move from left to right across a period, or row, of the periodic table which one decreases? A. Reactivity B. Ionization energy c. Electron affinity D. Number of valence electrons E. Atomic radius |
11 |
912 | Screening effect of inner shells decreases the effective nuclear charge. The order of screening effect of subshells is ( s>p>d>f ) State whether the given statement is true or false. A. True B. False |
11 |
913 | Pickout among the following: ( mathrm{LI}^{-}, mathrm{Be}^{-}, mathrm{C}^{-}, ) species which is least stable? |
11 |
914 | Which pair of atomic numbers represents s-block elements? A . 7, 15 B. 6, 12 c. 9,17 D. 3, 12 |
11 |
915 | What is the symbol of atomic number ( 117 ? ) A. Uus B. Uns c. uno D. uut |
11 |
916 | The group number of the element with atomic number 96 is 3 If true enter 1 , else enter 0 . |
11 |
917 | The IIA group metal ion having ( 6 s^{2}, 6 p^{6} ) as outer electron configuration is: A ( cdot C a^{2} ) в. ( S a^{2} ) ( c cdot B a^{2} ) D. ( R a^{2} ) |
11 |
918 | The major constituent of freshly obtained molasses is: A. sucrose B. fructose c. glucose D. methanol |
11 |
919 | Representative elements belong to: A. ( s ) -and ( p ) – block B. ( d- ) block c. ( d ) and f block D. ( f ) – block |
11 |
920 | What are the main feature of Mendeleev’s periodic table? |
11 |
921 | The first ionization energy for ( N a ) is ( 495 k J / m o l ) The BEST estimate for sodium’s second ionization energy would be A. ( 367 k J / ) mol в. ( 584 k J / m o l ) c. ( 690 k J / ) mol D. ( 4560 k J / ) mol |
11 |
922 | An element has 12 neutrons in its nucleus. To which group of the periodic table it will belong? ( A ) B. 2 ( c cdot 6 ) D. Impossible to predict |
11 |
923 | A type of ion found in sodium acetate is : A ( . x^{+} ) B. ( X^{2+} ) ( c cdot X^{3+} ) D. ( X O_{3}^{2-} ) E ( cdot X O_{4}^{2-} ) |
11 |
924 | Stability of ions of ( G e, S n ) and ( P d ) will be in the order: This question has multiple correct options A. ( G e^{2+}<S n^{2+} S n^{4+}>P b^{4+} ) |
11 |
925 | Elements which occupied the position in the Lother Meyer curve, on the peaks, were: A. alkali metals B. highly electropositive elements c. elements having large atomic volume D. all of the above |
11 |
926 | What were the criteria used by Mendeleev in creating his period. Why do you think the noble gases are placed in a separate group? |
11 |
927 | Paulings values of electronegativities are dependent upon: A. ionisation potentials B. bond energies c. electron affinities D. atomic radii |
11 |
928 | Name the following metals: A metal present in period ( 3, ) group 1 of the periodic table |
11 |
929 | The highest ionization energy is exhibited by: A. halogens B. alkaline earth metals c. transition metals D. noble gas |
11 |
930 | How many valence electrons are present in Eka – aluminium? A. B. 2 ( c cdot 3 ) ( D ) |
11 |
931 | Statement I: Atomic radius generally increases as you move across the periodic table from left to right. Statement II: The atomic number is increasing from left to right as you move across the periodic table A. Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement B. Both Statement I and Statement II are correct, but Statement II is not the correct explanation of Statement I. c. Statement lis correct, but Statement II is incorrect D. Statement I is incorrect, but Statement II is correct |
11 |
932 | The high ionistion potential of magnesium compared with aluminium is due to: A. filled orbitals in magnesium B. high nuclear charge in magnesium c. low radius of magnesium atom D. low effective nuclear charge in magnesium |
11 |
933 | Q1. Discuss the main features of long form of the periodic table. What are the advantages of long form of periodic table? die boble. |
11 |
934 | The value of ( square_{e q}^{infty} ) for ( N H_{4} C l, ) NaOH and NaCl are respectively, 149.74,248.1 and ( 126.4 Omega^{-1} c m^{2} e q u i v^{-1} . ) The value of ( square_{e q}^{infty} ) of ( N H_{4} O H ) is A . 371.44 B. 271.44 ( c cdot 71.44 ) D. Cannot be predicted from given data |
11 |
935 | In modern periodic table, if two elements have the same number of valence electrons, then they belong to the same: A. group B. period c. part D. none of the above |
11 |
936 | – 1.312 IU J MUI. Q16. Among the second period elements, the actual ionization enthalpies are in the order: Li<B< Be <C<O<N<F< Ne Explain why (i) Be has higher 4, H, than B? (ii) O has lower 4 H, than N and F? rbital while in |
11 |
937 | Question 36. Arrange the following in the order of property indicated for each set : (1) F2, Cl2, Br, 1-increasing bond dissociation enthalpy. (ii) HF, HCI, HBr, HEIncreasing acid strength. (ii) NH3, PH3, AsHz, SbH3, BiHz-increasing base strength. (1) F has small size; except it bond dissociation enthalpy decreases from Cl to l. (ii) From F to I, acid strength increases as H X bond distance increases. (iii) From N to Bi, basic strength decreases due to decrease in electron density. |
11 |
938 | Which of the following sequence contains atomic number of only representative elements? A. 55,12,48,53 в. 13,33,54,80 c. 3,33,53,87 D. 22,33,55,66 |
11 |
939 | Three elements ( X, Y ) and ( Z ) form a Dobereiner triad. The ratio of the atomic weight of ( X ) to that of ( Z ) is 7: 25 If the sum of the atomic weights of ( x ) and ( Z ) is 160 , find the atomic weights of ( X, Y ) and ( Z ) A ( . x rightarrow 35, Y rightarrow 80, Z rightarrow 125 ) в. ( x rightarrow 125, Y rightarrow 80, z rightarrow 35 ) c. ( x rightarrow 80, Y rightarrow 35, Z rightarrow 125 ) D. ( x rightarrow 80, Y rightarrow 125, z rightarrow 35 ) |
11 |
940 | What is the IUPAC symbol for Mendelevium? A. Md в. мп c. ме D. Mv |
11 |
941 | An atom has the symbol ( p ) ( q ) Which value determines the position of the element in the periodic table? A . B. 9 ( c cdot p-q ) D. p+q |
11 |
942 | Which of the following triads does not follow Dobereiner’s law of triads? A. ( mathrm{Li}, mathrm{Na}, mathrm{K} ) B. Ca, Sr, Ba c. вe, мg, са D. Cu, Ag, Au |
11 |
943 | The atomic weights of Be were corrected by Mendeleev using the formula: ( mathbf{A} cdot sqrt{v}=a(z-b) ) B. ( m v r=frac{n h}{2 pi} ) C. atomic weight = equivalent weight ( times ) valency D. equivalent weight = atomic weight ( times ) valency |
11 |
944 | Noble gases belongs to group of periodic table. A. VII A B. VIII A c. VIII B D. VIA |
11 |
945 | What is meant by periodicity in properties of elements with reference to the periodic table? | 11 |
946 | Which among the following element has largest atomic size? A. B. c. As D. sb |
11 |
947 | An element ( Z ) has atomic number 16 . Answer the following questions on ( Z ) : What kind of a compound is this? |
11 |
948 | Which of these choices is not a family of elements? A. Halogen B. Metal c. Inert Gas D. Fire extinguishers |
11 |
949 | All the elements in a group in the periodic table have similar: A. atomic weights B. number of valence electrons c. mass number D. atomic number |
11 |
950 | The number of periods present in the long form of the periodic table are: ( mathbf{A} cdot mathbf{6} ) B. 7 c. 8 D. 18 |
11 |
951 | 0.39 Although fluorine is more electronegative than oxygen, of oxygen to stabilise higher oxidation states exceeds that Why? multiple bond with |
11 |
952 | Gradual addition of electronic shell in the noble gases causes a decrease in their? A. Ionization energy B. Atomic radius c. Boiling point D. Density |
11 |
953 | The correct order of atomic size of Na, Be and Mg is: ( A cdot B e>M g>N a ) в. ( mathrm{Na}>mathrm{Mg}>mathrm{Be} ) c. ( mathrm{Mg}>mathrm{Na}>mathrm{Be} ) D. ( N a=M g>B e ) |
11 |
954 | Q5. In terms of period and group where will you locate the element with z = 114? Ans Period 7 and 1 |
11 |
955 | The vertical columns in Mendeleev’s table were called: A. verticals B. periods c. columns D. groups |
11 |
956 | According to Mendeleev’s periodic table, one element whose atomic mass is greater than that of nickel is placed before Nickel. Name the element: A. copper B. Iron c. zinc D. cobal |
11 |
957 | The Inner Transition elements are classified as A. Lanthanides and Actinides B. Metals and Non-metals c. Both A and B D. None of these |
11 |
958 | LUDIL. TI U JUICK LU IU Wu Classily elenlerlis LO BOUP E Q3. What is the basic difference in approach between Mendeleev’s Periodic Law and the Modern Periodic Law? TILHA ondolo’s Periodic Law and Modern |
11 |
959 | For ( B e, Z_{e f f}=1.95 ) and for ( boldsymbol{B} boldsymbol{e}^{boldsymbol{x}+}, boldsymbol{Z}_{boldsymbol{e f f}}=mathbf{2 . 3 0 .} ) Hence, ion is: ( mathbf{A} cdot B e^{+} ) в. ( B e^{2} ) ( mathbf{c} cdot B e^{3+} ) D. ( B e ) |
11 |
960 | Give the names and atomic numbers of the first and last members of the lanthanide series. |
11 |
961 | In terms of period and group where would you locate the element with ( z= ) ( 114 ? ) |
11 |
962 | Which of the following give the correct increasing order of the atomic radii of ( boldsymbol{O}, boldsymbol{F}, boldsymbol{a} boldsymbol{n} boldsymbol{N} ? ) A. ( O, F, N ) в. ( N, F, O ) c. ( O, N, F ) D. ( F, O, N ) |
11 |
963 | Identify the elements in the Periodic Table: A: Which shows diagonal relationship to ( B e ) B: Which shows diagonal relationship to ( L i ) A. ( A: A l, B: M g ) в. ( A: S i, B: M g ) c. ( A: M g, B: A l ) D. ( A: A l, B: S i ) |
11 |
964 | Q24. Describe the theory associated with the radius of an atom as it: (a) gains an electron (b) loses an electron? |
11 |
965 | The ionization potential ( left(I_{1}right) ) of nitrogen ( (Z=7) ) is more than oxygen ( (Z=8) ) This is explained by : A. Hunds rule B. Excitation rule c. Pauli principle D. Aufbau principle |
11 |
966 | In which period of the periodic table,will an element, be found whose differentiating electron is a ( 4 mathrm{d} ) electron? |
11 |
967 | Is Fe, Co, Ni are Dobereiner triad? | 11 |
968 | Which of the following elements does not belong to p-block? A . sr B. Po c. As D. Ga |
11 |
969 | Following question is based on ( S c(Z= ) 21). For any ( 1 s ) electron, ( Z^{*} ) (effective nuclear charge) is : A . 21.0 B. 20.65 c. 16.85 D. 9.75 |
11 |
970 | An element which is an essential constituent of all organic compounds belongs to : A. group 1 B. group 14 c. group 15 D. group 16 |
11 |
971 | Assertion The first ionization energy of Be is greater than that B. Reason 2p orbital is lower in energy than 2 s. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Assertion is incorrect but Reason is correct |
11 |
972 | Na, Mg and Al are the elements having one, two and three valence electrons respectively. Which of these elements (i) has the largest atomic radius, (ii) is least reactive? Justify your answer stating reason for each. |
11 |
973 | The ( I P_{1} ) value of potassium is less than the ( I P_{1} ) value of sodium. This is due to: A. large size of potassium atom B. small size of potassium atom c. low density of potassium D. univalent nature of potassium |
11 |
974 | An element ( A ) combines with oxygen to form an oxide ( A O . ) Find the group to which the element ( boldsymbol{A} ) belongs. A . ( I A ) в. ( I I A ) c . III ( A ) D. IVA |
11 |
975 | Select the correct statement(s) among the following. a. Electron gain enthapy of ( A s ) is more negative than ( C l ) b. (+3) oxidation state are shown by ( boldsymbol{S} boldsymbol{b} ) and ( B i ) both c. ( boldsymbol{P} ) is more electronegative than ( boldsymbol{N} ) ( A cdot a, b ) and ( c ) B. b only c. a and bonly D. b and conly |
11 |
976 | What s the basis of triad formation of elements? |
11 |
977 | The first element of actinide series is : A. thorium B. cerium c. lanthanum D. actinium |
11 |
978 | With respect to oxygen maximum oxidation state is shown by A. Halogen family B. Oxygen family c. Nitrogen family D. Boron family |
11 |
979 | The last element in period 2 is lithium A. True B. False |
11 |
980 | 8. The energy needed to remove a single electron (most loosely bound) from an isolated gaseous atom is called (a) ionisation energy (b) electronegativity (C) kinetic energy (d) electron affinity |
11 |
981 | John Newland arranged the element starting with hydrogen and ending at A. cerium B. calcium c. thorium D. rubidium |
11 |
982 | Differentiating electron in inner transition elements enters the orbital.(s/p/d/f) |
11 |
983 | The elements of one period are given below in order from left to right ( boldsymbol{L} boldsymbol{i}, boldsymbol{B} boldsymbol{e}, boldsymbol{B}, boldsymbol{C}, boldsymbol{O}, boldsymbol{F}, boldsymbol{N} boldsymbol{e} ) Which is the missing element? A . Na a B. c. ( c 1 ) ( D ) |
11 |
984 | Predict the position of the elements which form the largest cation and the smallest anion in the modern periodic table. |
11 |
985 | Example of Dobereiner’s triad is A. ( L i, ) Al ( , C a ) в. ( L i, N a, K ) c. ( L i, K, N a ) D. ( K, A l, C a ) |
11 |
986 | An element with electronic arrangement as 2,8,18,1 will exhibit which of the following stable oxidation states? A. +2 and +4 B. +1 and +2 ( mathbf{c} cdot+2 operatorname{to}+7 ) D. +1 only |
11 |
987 | Which of the following pairs has both elements from the same group? A. ( M g, R a ) в. ( M n, C l ) c. ( M g, C u ) D. ( M g, C l ) |
11 |
988 | Which amongst the following is not an alkaline earth metal? ( A cdot ) Mg B. Ba ( c . F r ) D. sr |
11 |
989 | If the same element is forming oxides in different oxidation states, then, which of the following statement is incorrect? This question has multiple correct options A. Oxide will be neutral in nature in which element is in its highest oxidation state B. Oxide will be highly acidic in nature in which element is in its highest oxidation state c. oxide will be amphoteric in nature in which element is in its highest oxidation state D. oxide will be highly basic in nature in which element is in its highest oxidation state |
11 |
990 | What is the name for the horizontal rows of the periodic table? A. Groups B. Periods c. Families D. sets |
11 |
991 | Which element is considered radioactive among the options given below? A. Sodium B. Gold c. Thorium D. Neon |
11 |
992 | An element in period-3 which has zero electron affinity is: A. neon B. sulphur c. sodium D. argon |
11 |
993 | The number of metals from the following: ( boldsymbol{A} boldsymbol{s}, boldsymbol{F} boldsymbol{e}, boldsymbol{X} boldsymbol{e}, boldsymbol{L} boldsymbol{i}, boldsymbol{B}, boldsymbol{C l}, boldsymbol{B} boldsymbol{a}, boldsymbol{P}, boldsymbol{I}, boldsymbol{S} boldsymbol{i} ) |
11 |
994 | The electronegativites of the following elements ( H, O, F, S ) and ( C l ) increase in the order: A. ( H<O<F<S<C l ) в. ( S<H<C l<O<F ) c. ( H<S<O<C l<F ) D. ( H<S<C l<O<F ) |
11 |
995 | An element A has atomic number 7. It will have properties similar to the element with the atomic number: A. 85 B. 57 ( c cdot 26 ) D. 51 |
11 |
996 | Mendeleev’s Periodic Table was published in a in 1872. A. German journal B. US journal c. Russian journal D. None of the above |
11 |
997 | Considering their electrons affinities, it is possible for alkali metals to form an anion like ( mathrm{M}^{-} ) where M represents an alkali metal. If true enter 1 , else enter 0 . |
11 |
998 | PU 6. In halogens, which of the following increases from iodine to fluorine? (a) Bond length (b) Electronegativity (@) The ionization energy of the element (d) Oxidizing power nilalatiansbih |
11 |
999 | Which of the following statements are true about the modern form of the periodic table? A. Properties of the elements are the periodic functions of their atomic number B. There are 7 periods c. There are 18 numbered groups D. All of the above |
11 |
1000 | Why is there a gradual increase in the ionisation energy from ( L i ) to ( N e ? ) A. Increase in atomic size B. Decrease in nuclear charge c. Atomic size remains same D. Increase in nuclear charge |
11 |
1001 | Match list I (atomic number of the elements) with list II (position in the periodic table) and select the correct answer using the codes given below the lists. begin{tabular}{c|cc|c} & List I & & List II \ A. & 52 & 1. & s-block \ B & 56 & 2. & p-block \ c. & 57 & 3. & d-block \ D. & 60 & 4. & f-block end{tabular} A. ( A-2, B-1, C-3, D-4 ) B. ( A-2, B-1, C-4, D-3 ) ( c ) ( A-1, B-2, C-3, D-4 ) D. ( A-1, B-2, C-4, D-3 ) |
11 |
1002 | The number of electrons in the valence shell of group 1 elements. ( mathbf{A} cdot mathbf{1} ) B. 2 ( c cdot 3 ) ( D ) |
11 |
1003 | Which of the following is a defect in the Mendleev’s periodic table? A. Prediction of new elements B. Doubtful atomic weights c. Anomalous position of hydrogen D. Non-systematic study of elements |
11 |
1004 | Which element has the highest first ionization potential? A . B. Ne c. не D. E. ( L ) |
11 |
1005 | Which of the following sets of elements follows Newland’s octave rule? A. ( B e, M g, C a ) в. ( N a, K, R b ) c. ( F, C l, B r ) D. ( B, A l, G a ) |
11 |
1006 | Arrange the following as per the instructions given in the brackets: ( N a, K, C l, S, S i ) (increasing order of ionization energy) |
11 |
1007 | A, ( B, C ) are three elements with atomic numbers, Z-1, Z and Z+1 respectively. B is an inert gas. Identify the elements having same valence shell. ( A cdot A, B ) B. В, с c. ( A, C ) D. A, B, C |
11 |
1008 | From among the elements, choose the following: ( mathrm{Cl}, mathrm{Br}, mathrm{F}, mathrm{O}, mathrm{Al}, mathrm{C}, mathrm{Li}, mathrm{Cs} ) and ( mathrm{Xe} ) The element which belongs to zero group. |
11 |
1009 | Metal which emits photo-electrons very easily is : ( A cdot A ) B. ( c cdot c s ) D. cu |
11 |
1010 | All the elements of the same group have similar ( _{text {一一一一一一一一 }} ) properties. | 11 |
1011 | Correct the mistakes, if any in the following statement. ¡) Second period is a short period. It contains only two elements. ii) Group 18 elements are called Halogen family. |
11 |
1012 | In which group all the elements do not have same number of valence electrons? A. zero B. first c. second D. seventh |
11 |
1013 | An element ( X ) combines with oxygen to form an oxide ( X_{2} O . ) This oxide is electrically conducting. (i) How many electrons would be there in the outermost shell of the element ( boldsymbol{X} ) (ii) To which group of the periodic table does the element ( X ) belong. (iii) Write the formula of the compound which is formed when ( X ) reacts with chlorine. |
11 |
1014 | Which of the following are the demerits of Mendeleev periodic table? This question has multiple correct options A. No proper position for hydrogen is given. B. Grouping of chemically dissimilar elements. C. Position given to isotopes. D. Presence of anomalous pairs. |
11 |
1015 | Total no. of compound which are not possible? ( boldsymbol{P} boldsymbol{C} boldsymbol{I}_{5}, boldsymbol{N} boldsymbol{C} boldsymbol{I}_{5}, boldsymbol{O} boldsymbol{F}_{4}, boldsymbol{O} boldsymbol{F}_{2}, boldsymbol{S} boldsymbol{F}_{4} ) ( boldsymbol{S} boldsymbol{F}_{6}, boldsymbol{P H}_{5}, boldsymbol{X} boldsymbol{e} boldsymbol{H}_{4}, boldsymbol{X} boldsymbol{e} boldsymbol{F}_{4}, boldsymbol{I} boldsymbol{F}_{7}, boldsymbol{I} boldsymbol{H}_{5} ) ( boldsymbol{P B r}_{6}^{-}, boldsymbol{C l F}_{3} ) |
11 |
1016 | Identify the correct order of solubility in aqueous medium: A ( cdot C u S>Z n S>N a_{2} S ) в. ( Z n S>N a_{2} S>C u S ) c. ( N a_{2} S>C u S>Z n S ) D. ( N a_{2} S>Z n S>C u S ) |
11 |
1017 | You will find metals on the extreme right side of the periodic table. A. True B. False |
11 |
1018 | The property which regularly increases down the group in the periodic table is: A. ionisation energy B. electronegativity c. reducing nature D. electron affinity |
11 |
1019 | Which group in p-block elements shows highest positive oxidation state? A . 16 B. 17 c. 18 D. 15 |
11 |
1020 | The law of octaves was proposed by : A. Newlands B. Dobereiner c. Lavoisier D. Mendeleev |
11 |
1021 | 0.15 Those elements impart colour to th elements impart colour to the flame on heating in it, the atoms of which require low energy for the ionisation (i.e., absorb energy in the visible region of spectrum). The elements of which of the following groups will impart colour to the flame ? (a) 2 (b) 13 (c) 1 (d) 17 |
11 |
1022 | In Mendeleev’s periodic table, the gap was not left for one of the following elements. This element is: A. potassium B. beryllium c. germanium D. scandium |
11 |
1023 | Q. 35 How would you explain the fact that the first ionisation enthalpy of sodium is lower than that of magnesium but its second ionisation enthalpy is higher than that of magnesium? |
11 |
1024 | Which of the following is not a periodic property for the elements? A. Electronegativity B. Atomic size c. occurrence in nature D. lonization energy |
11 |
1025 | The tendency of a bonded atom in a molecule to lose or repel the electron density of a shared pair of electrons is called: A. electro negativity B. electropositivity c. electroneutrality D. none of these |
11 |
1026 | Nitrogen ( (z=7) ) is the element of group V of the periodic table. Which of the following is the atomic number of the next element in the group? ( A cdot 9 ) B. 14 c. 15 D. 17 |
11 |
1027 | The atomic number of an element that belongs to the IVA (or 14) group and 4th period is: A . 32 B. 30 ( c cdot 34 ) D. 36 |
11 |
1028 | Find the number of an element(s) which is/are present in group-II. ( boldsymbol{B} boldsymbol{a}, boldsymbol{K}, boldsymbol{C} boldsymbol{a}, boldsymbol{C} boldsymbol{s}, boldsymbol{R} boldsymbol{b}, boldsymbol{n} ) |
11 |
1029 | The number of ionization energies carbon can have are: A . 1 B. 2 ( c cdot 4 ) ( D ) |
11 |
1030 | lonic mobility of ( mathrm{Li}^{+} ) is greater than that of ( mathrm{Na}^{+} ) A. True B. False |
11 |
1031 | ( ^{35} C l ) and ( ^{37} C l ) are the two isotopes of chlorine, in the ratio 3: 1 respectively. If the isotope ratio is reversed the average atomic mass of chlorine will be: ( mathbf{A} cdot 35.0 u ) B. ( 35.5 u ) c. ( 36.0 u ) D. 36.5 ( u ) |
11 |
1032 | 021. Would you expect the second electron gain enthalpy of O as positive, more negative or less negative than the first? Justify your answer. |
11 |
1033 | Give a reason for the following. lonisation potential increases across a period, from left to right. | 11 |
1034 | The dominant factor in determining the IE of the elements on moving down the groups is its: A. atomic radius B. effective nuclear charge c. Both (a) and (b) D. None of the above |
11 |
1035 | An element belongs to the 3 rd period and Group II of the periodic table. Name of the element is A. magnesium B. sodium c. aluminium D. calcium |
11 |
1036 | lonization Energy ( (boldsymbol{k} boldsymbol{J} / boldsymbol{m} boldsymbol{o l}) ) First [ 896 ] Secon [ 1,752 ] Third [ 14,807 ] Fourth [ 17,948 ] The table above shows the first four ionization energies of an element. This element is located in which group of the periodic table? A. Group 1 B. Group 2 C . Group 3 D. Group 4 |
11 |
1037 | The only non-metal which is liquid at ordinary temperature is ( B r_{2} ) A. True B. False |
11 |
1038 | Number of elements in Lanthanide family is: |
11 |
1039 | Out of the following outer electronic configurations of atoms, the highest oxidation state is achieved by which one? A ( cdot(n-1) d^{8} n s^{2} ) B . ( (n-1) d^{5} n s^{2} ) c. ( (n-1) d^{3} n s^{2} ) D・ ( (n-1) d^{5} n s^{1} ) |
11 |
1040 | Which statement describes positive ions? A. Positive ions have more electrons than neutrons B. Positive ions have more protons than neutrons C. Positive ions have more electrons than protons D. Positive ions have more protons than electrons |
11 |
1041 | Which of the following pair represents elements of same group? A . Q, R B. P,Q ( c cdot P, s ) D. Q, |
11 |
1042 | Q1. Give the name and atomic number of the inert gas atom in which the total number of d-electrons is equal to the difference between the numbers of total p and total s-electrons. 10 |
11 |
1043 | Q1. Arrange the following as stated: (i) N,, ,, F, C1, (Increasing order of bond dissociation energy) (ii) F, CI, Br, I (Increasing order of electron gain enthalpy) (iii) ,,N,,C,, , (Increasing order of bond length). |
11 |
1044 | 38 Explain the deviation in ionisation enthalpy of some elements from the general trend by using given figure. 2500+ 2000+ (2080) Ne, lonisation enthalpy A H/kJ mol (1681) FA 1500 (1402) N (1314) 1000+ (899) Bex (1086) B (801) 5007 (520) Li/ 0 1 2 3 4 5 6 7 8 9 Atomic number of elements – 10 |
11 |
1045 | The total number of elements in the group ( I B ) is: A . 4 B. 5 ( c .7 ) D. 9 |
11 |
1046 | An element R belongs to IVA(14) group and 3rd period in the periodic table. Arrange the elements that are placed below ‘R’ in increasing order of atomic size. A. ( G e>S n>P b ) B. ( A s>S b>B i ) c. ( G e<S n<P b ) D. ( A s<S b<B i ) |
11 |
1047 | Which of the following are transition elements? ( mathrm{K}, mathrm{Mn}, mathrm{Ca}, mathrm{Cs}, mathrm{Fe}, mathrm{Cu}, mathrm{Pb} ) |
11 |
1048 | Who proposed the law of traids? | 11 |
1049 | Write the electronic configuration of Sr ( ^{2+} ) in absence of Aufbau Principle. ( mathbf{A} cdot 1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{6} 3 d^{10}, 4 s^{2} 4 p^{5} 4 d^{1} ) B. ( 1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{6} 3 d^{10}, 4 s^{2} 4 p^{3} 4 d^{3} ) C ( cdot 1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{6} 3 d^{10}, 4 s^{2} 4 p^{6} ) D. None of these |
11 |
1050 | The three elements ( A, B ) and ( C ) with similar properties have atomic masses ( x, Y ) and ( z ) respectively. The mass of ( Y ) is approximately equal to the average mass of ( X ) and ( Z . ) Such an arrangement of elements called as: A. Dobereiner triad B. Mendeleev triad c. Modern triad D. none of the above |
11 |
1051 | Which of the following is a highly polar bond? A ( . O-H ) в. ( N-H ) c. ( H-C l ) D. ( H-F ) |
11 |
1052 | How many electrons does oxygen have in its outermost shell? | 11 |
1053 | Write the general outer electronic configuration of ( s, p, d ) and ( f ) block elements. | 11 |
1054 | Which of the following sulphates has the highest solubility in water? A ( . . M g S O_{4} ) в. ( B a S O_{4} ) ( mathrm{c} cdot mathrm{CaSO}_{4} ) D. ( B e S O_{4} ) |
11 |
1055 | Which of the following elements has lowest electronegativity? A. ( N a ) в. ( M g ) c. ( A l ) D. ( S ) i |
11 |
1056 | Which of the following sets belongs to the same period: A. ( L i, N a, K ) в. ( L i, M g, C a ) c. ( N i, C u, Z n ) D. ( F, C l, B r ) |
11 |
1057 | Identify the correct match(es) in the following table: ( begin{array}{ll}text { Element } & text { Column A } \ text { Sodium } & text { Non-metal } \ text { Sulphur } & text { Lanthanide } \ text { Manganese } & text { Metal } \ text { Cerium } & text { Transition metal }end{array} ) A. Sodium- Metal B. Sulphur- Non metal c. Manganese- Transition metal D. all of these |
11 |
1058 | Q. 14 Which of the following elements can show covalencey greater (a) Be (b) P (d) B W covalencey greater than 4? (c) S |
11 |
1059 | Which of the following statements is not correct for the periodic classification of elements? A. The properties of elements are the periodic functions of their atomic numbers. B. Non – metallic elements are lesser in number than metalic elements C. The first ionization energies of elements along a period do not vary in regular manner with increase in atomic number D. For transition elements, the d-sub shells are filled with electrons monotonically with increase in atomic number. |
11 |
1060 | Write the electronic configuration of Elements with an electron sextet, e.g. ( boldsymbol{O}, boldsymbol{S}, boldsymbol{e t c} ) |
11 |
1061 | Statement 1: For an element with an atomic number of ( 17, ) the most probable oxidation number is +1 Statement 2: The outer energy level of the halogen family has a tendency to add one electron to itself A. Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1 B. Both Statement 1 and Statement 2 are correct and Statement 2 is not the correct explanation of Statement 1. c. statement 1 is correct but Statement 2 is not correct D. Statement 1 is not correct but Statement 2 is correct E. Both the Statement 1 and Statement 2 are not correct. |
11 |
1062 | Which of the following has the highest electronegativity? A . Na a B. cl ( c cdot k ) ( D ) |
11 |
1063 | The single-bonded metallic radius of Na is 157 pm. What is the reasonable estimate of the radius of Na assuming that the increment between radii of different magnitudes is 60 pm? ( A cdot 97 mathrm{pm} ) B. 95 pm ( c cdot 93 p m ) D. 99 pm |
11 |
1064 | True or False VI A group elements are known as chalcogens. |
11 |
1065 | The correct statement among the following is:
This question has multiple correct options |
11 |
1066 | Why was the basis of classification of elements changed from the atomic mass to the atomic number? |
11 |
1067 | On moving down the group, the tendency to gain electrons: A. decreases B. increases C. increases and then decreases D. decreases and then increases |
11 |
1068 | The element with highest electronegativity value is : A. carbon B. Chlorine c. Fluorine D. oxygen |
11 |
1069 | The increasing order of reactivity among group 1 element is ( L i<N a< ) ( R bC I>B r>I . ) Explain? |
11 |
1070 | Which of the following statements are correct about Mendeleev’s periodic table? i) It is based on increasing order of atomic numbers. ii) Mendeleev corrected the atomic weight of some elements like Be, In etc. iii) ( left(boldsymbol{A} boldsymbol{r}, boldsymbol{H}_{2}right),left(boldsymbol{C o}, boldsymbol{C l}_{2}right),left(boldsymbol{T} boldsymbol{e}, boldsymbol{F}_{2}right) ) are three inverted pairs. iv) It is based on increasing order of atomic weights. A. only (i) correct B. (ii) and (iv) are correct c. only (iii) correct D. (i) and (iv) are correct |
11 |
1071 | The elements ( A ) and ( B ) obey Newland’s law of octave. How many elements are there between ( A ) and ( B ? ) A. 7 B. 8 ( c .5 ) D. 6 |
11 |
1072 | According to Dobereiner in Triads, atomic weight of the centre element is equal to 1st and 3rd elements in that triads. A. Geometric Mean B. Arithmetic Mean c. Harmonic Mean D. None of these |
11 |
1073 | Which of the following indicates the correct order of variation in atomic size? A. ( B e>C>F>N e ) в. ( B e>C>F<N e ) c. ( B e<C<F<N e ) D. ( F<N e<B e<C ) ( C ) |
11 |
1074 | The most stable oxidation state of Thallium is: ( A cdot+1 ) B. +3 ( c cdot+4 ) D. +6 |
11 |
1075 | Which of the following has zero electronegativity? A . ( A r ) B. ( S ) i c. ( N ) D. ( F ) |
11 |
1076 | Q11. Define electron gain enthalpy. What are its units? | 11 |
1077 | The atomic number of the element next to bromine (atomic no 35 ) in the same group is: A . 43 B. 50 ( c .56 ) D. 53 |
11 |
1078 | The first attempt to classify elements systemically was made by : A. Mendeleev B. Newland c. Lother Meyer D. Dobereiner |
11 |
1079 | (a) What are isotopes? (b) State modern periodic law. (c) Name two noble gas. |
11 |
1080 | Q Type your question Why may be members of the same family, it does mean that they will behave in similar ways. The same things can be said about elements in a group (“family”) on the periodic table. For example, fluorine and iodine are members of the halogen family, but their physical properties are different, as shown in the table below. |
11 |
1081 | An element ( X ) belongs to group III-A and 4 th period in the periodic table. Find out the atomic numbers of ( X ) and the element which is placed just below ( boldsymbol{X} ) in the periodic table. |
11 |
1082 | Eka-aluminium forms chloride of the type : A ( cdot E_{2} C l ) в. ( E C l_{3} ) ( mathbf{c} cdot E_{2} C l_{3} ) D. ( E_{3} C l_{4} ) |
11 |
1083 | The correct order of the second ionisation potential of carbon, nitrogen, oxygen and fluorine is : A. ( C>N>O>F ) в. ( O>N>F>C ) с. ( O>F>N>C ) |
11 |
1084 | Q5. Elements A, B, C and D have atomic numbers 12, 19, 29, and 36 respectively. On the basis of electronic configuration, write to which group of the periodic table each element belongs. |
11 |
1085 | Which of the following compound has no existence? A. ( mathrm{CF}_{4} ) B. ( mathrm{XeF}_{4} ) ( mathrm{c} cdot mathrm{KrF}_{4} ) D. HeF ( _{4} ) |
11 |
1086 | ( H_{2} O ) is a liquid but ( H_{2} S ) is a gas. Explain why? |
11 |
1087 | Which will be the third element among the given elements to complete given Doberiener triad? (Atomic mass of Be ( 9 ; ) Na ( 23 ; ) Mg ( 24 ; ) si 28; Cl 35; Ca 40) ( mathrm{Be},_{-}-_{-}, mathrm{Ca} ) |
11 |
1088 | ldentify the noble gas in the ( 4^{t h} ) period. | 11 |
1089 | . 4 The first ionisation enthalpies of Na, Mg, Al and Si are in the order (a) Na Al Mg > Al > Si (c) Na < Mg < Al Mg > Al < Si Ans.(a) Follow the following stens to sobre ou unh nrohlo |
11 |
1090 | consist of atoms that have valence electrons in a ( boldsymbol{d}- ) subshell. A. Alkali metals B. Alkaline earth metals c. Transition metals D. Halogens |
11 |
1091 | The atomic number of elements ( A, B ) and ( C ) are ( (Z-1), Z ) and ( (Z+1) ) respectively. B is an inert gas (not helium). Which element among ( A, B ) and C has the highest ionization energy? Why? |
11 |
1092 | Which of the following sequence is correct for decreasing order of ionic radius? A ( cdot S e^{-2}, I^{-}, B r^{-}, O^{-2}, F^{-} ) B . ( I^{-}, S e^{-2}, O^{-2}, B r^{-}, F^{-} ) c. ( S e^{-2}, I^{-}, B r^{-}, F^{-}, O^{-2} ) D. ( I^{-}, S e^{-2}, B r^{-}, O^{-2}, F^{-} ) |
11 |
1093 | Which of the following will have the most negative electron gain enthalphy and which the least negative? ( A cdot F, C ) в. С।, c. ( mathrm{Cl} ), D. CL, |
11 |
1094 | The chemistry of lithium is very similar to that of magnesium even though they are placed in different groups. Its reason is that: A. both are found together in nature B. both have nearly the same size c. both have similar electronic configurations D. the ratio of their charge to size is nearly the same |
11 |
1095 | Arrange following oxides in increasing acidic nature. ( boldsymbol{L} boldsymbol{i}_{2} boldsymbol{O}, boldsymbol{B} boldsymbol{e} boldsymbol{O}, boldsymbol{B}_{2} boldsymbol{O}_{3} ) A. ( L i_{2} O<B e O<B_{2} O_{3} ) в. ( B e O<L i_{2} O<B_{2} O_{3} ) c. ( L i_{2} O<B_{2} O_{3}<B e O ) D. None of these |
11 |
1096 | Actinides belong to which period? A .4 B. 5 ( c .6 ) D. |
11 |
1097 | The element having electronic configuration ( [boldsymbol{K} boldsymbol{r}] boldsymbol{4} boldsymbol{d}^{10} boldsymbol{4} boldsymbol{f}^{14} boldsymbol{5} boldsymbol{s}^{2} boldsymbol{5} boldsymbol{p}^{6} boldsymbol{5} boldsymbol{d}^{1} boldsymbol{6} boldsymbol{s}^{2} ) belongs to A. s-block B. p-block c. d-block D. f-block |
11 |
1098 | In long form of periodic table, the total number of periods is: A. 5 B. 7 ( c cdot 8 ) D. |
11 |
1099 | The shielding constant ‘ ( sigma^{prime} ) for ( _{7} N ) atom is : A . 3.10 B. 3.40 c. 3.80 D. 4.20 |
11 |
1100 | Assertion ( F ) -atom has less electron affinity than ( C l^{-} ) atom. Reason Additional electrons are repelled more effectively by ( 3 p ) electrons in ( C l ) atom than by ( 2 p ) electrons in ( F ) -atom. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Assertion is incorrect but Reason is correct |
11 |
1101 | Of the following, the wrong statement is: A. the first ionization potential of ( A ) l is less than the first ionization potential of Mg. B. the second ionization potential of Mg is greater than the second ionization potential of ( mathrm{Na} ) C. the first ionization potential of Na is less than the first ionization potential of Mg. D. the third ionization potential of Mg is greater than the third ionization potential of Mg. |
11 |
1102 | Less amount of energy is required to remove ‘s’ electron than ‘p’ electron. A. True B. False |
11 |
1103 | begin{tabular}{ll|l} & ( mathbf{X} ) & ( mathbf{Y} ) \ & & \ Normal & 2,8,7 & \ Electronic & & 2,8,2 \ Configuration & Dissolves in & Very low \ Nature of & water and & solubility in \ oxide & turns blue & water. \ & litmus red & Dissolves in \ & & hydrochloric \ Tendency for & acid \ oxidising & Tends to & Tends to act \ and reducing & oxidise & as a \ reactions & elements & reducing \ Electrical and & and & agent \ thermal & compounds & Good \ conductivity & Very poor & Electrical \ & electrical & conductor \ & conductor & Good \ & Poor thermal & Thermal \ & conductivity & conductor \ Tendency to & & \ form & No tendency & \ alloys and & to form & Forms alloys \ amalgums & alloys & end{tabular} Using the information above, complete the following Non-metallic elements tend to be electricity |
11 |
1104 | The halogens (group 17 elements): A. have an electronic configuration of a noble gas B. are highly electropositive character C. show variable oxidation state of -1,+1,+3,+5 and +7 in their various compounds D. forms a volatile, covalent hydrides HX in which the halogen (X) shows an oxidation state of +1 |
11 |
1105 | Which of the following sets of atomic masses do not correspond to Dobernier traid? This question has multiple correct options A .7,23,39 в. 20,38,56 c. 47,91,178 D. 54,95,183 |
11 |
1106 | Which is the correct in the following? A ( . ) Radius of ( C l ) is ( 0.99 AA ), while that of ( C l^{+} ) ion is 1.54 A. B. Radius of ( C l ) atoms is 0.99 , ( hat{A} ), while that of ( N a ) atom is 1.54 月. C. Radius of ( C l ) atoms is 0.99 , a , while that of ( C l^{-} ) ion is ( 0.81 A ) D. Radius of ( N a ) atoms is 0.95 , ( dot{A} ), while that of ( N a^{+} ) ion is ( 1.54 AA ) |
11 |
1107 | Nobel gases were included in Mendeleev’s periodic table in the: A. 1 st group B. 7th group c. 8 th group D. none of these |
11 |
1108 | The stability of cation in dihalides of Si, Ge, Sn and Pb increases in the sequence is: A ( cdot G e X_{2}<operatorname{Si} X_{2}<S n X_{2}<P b X_{2} ) B. ( operatorname{SiX}_{2}<operatorname{GeX}_{2}<operatorname{Pb} X_{2}<operatorname{SnX}_{2} ) c. ( operatorname{six}_{2}<operatorname{Ge} X_{2}<operatorname{Sn} X_{2}<operatorname{Pb} X_{2} ) D. ( P b X_{2}<operatorname{Sn} X_{2}<G e X_{2}<operatorname{Si} X_{2} ) |
11 |
1109 | Where would you locate the element with electronic configuration 2,8 in the modem period table? A. Group 8 B. Group 2 c. Group 10 D. Group 18 |
11 |
1110 | The electronic configuration of ( boldsymbol{H} e ) is 2 and that of oxygen is |
11 |
1111 | Which of the following is the general electronic configuration in the valence shell of elements of a group ( -16 ? ) A ( cdot n s^{2} n p^{3} ) В. ( n s^{2} n p^{4} ) c. ( n s^{2} n p^{6} ) D. ( n s^{2} n p^{5} ) |
11 |
1112 | If the second I.P of calcium is 275.12 kcals ( m o l^{-1}, ) then, the equation that represents this ionization can be written as: A ( cdot C a_{(S)}^{+} rightarrow C a_{(S)}^{3+}+2 e^{-}-275.12 ) kcals B. ( C a_{(S)}^{+} rightarrow C a_{(S)}^{3+}+2 e^{-}+275.12 ) kcals c. ( C a_{(S)}^{+} rightarrow C a_{(S)}^{2++}+e^{-}+275.12 ) kcals D. ( C a_{(S)}^{+} rightarrow C a_{(S)}^{2+1}+e^{-}-275.12 ) kcals |
11 |
1113 | Assertion The first IE of ( B e ) is greater than that of ( boldsymbol{B} ) Reason ( 2 p ) -orbital is lower in energy than ( 2 s ) A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Assertion is incorrect but Reason is correct |
11 |
1114 | How does the electronic configuration of an atom relate to its position in the Modern Periodic Table? | 11 |
1115 | Which of the following is true regarding periodicity of elements? A. Elements of same group are characterized by same valence shell electronic configuration. B. The most electropositive elements are positioned on right hand side of the Modern periodic Table C. On going from Li of F there would be decrease in ionization energy D. reducing property of elements increases from Na to Cl in 3 rd period elements. |
11 |
1116 | What were the two criteria used by Mendeleev in creating his Periodic Table? | 11 |
1117 | The diagram represents an atom ‘X’. Answer the following. f atom ‘X’ has 1 electron in its outer shell, is it a non-metal. A. True B. False |
11 |
1118 | As you move from top to bottom on the periodic table, what generally happens to the atomic radius? A. It decreases B. It decreases, then increases c. It remains constant D. It increases, then decreases E. It increases |
11 |
1119 | A paste of substance ( A ) is used to decorate the ceiling of your home. State the name of the product in the above reaction. |
11 |
1120 | Symbol of palladium is: A. ( P ) в. ( P o ) c. ( P d ) D. ( P h ) |
11 |
1121 | In which one of the following pairs the radius of the second species is greater than that of the first? A. ( N a, M g ) B. ( O^{2-}, N^{3-} ) c. ( L i^{+}, B e^{2+} ) D. ( B a^{2+}, S r^{2+} ) |
11 |
1122 | Maximum work in periodic table related with atomic number was done by: A. Mendeleev B. Aston c. Mosley D. Newland |
11 |
1123 | Assertion First period of periodic table is the shortest period. Reason K shell can accommodate a maximum of two electrons A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Assertion is incorrect, but reason is correct. |
11 |
1124 | lonization potential values of an element ( X ) are 104 kJ, 200 kJ, 420 kJ 2825 kJ per mole. Identify the group to which the element belongs? A. ( I A ) в. ( I I A ) c. ( I I I A ) D. ( I V A ) |
11 |
1125 | Which of the following is the correct set of elements to Dobereiner’s triads? A. Li-7, Na – 23, K -39 B. Br-80, CI-35.5,1-127 c. Fe ( -55.85, ) Ni ( -58.71, ) Co -58.93 D. All of these |
11 |
1126 | First long period contains elements. A . 8 B. 18 ( c .32 ) ( D ) |
11 |
1127 | Atomic number of an element ( X ) is 16 its group number will be : A . 14 B . 15 c. 16 D. 17 |
11 |
1128 | Electronic configuration of Gd(64) is written as: ( [boldsymbol{X} boldsymbol{e}]_{54} boldsymbol{4} boldsymbol{f}^{x} boldsymbol{5} boldsymbol{d}^{1} boldsymbol{6} boldsymbol{s}^{2}, ) then the value of ( x ) is ( 7 . ) If true enter 1 , else enter 0 |
11 |
1129 | Be, ( M g, C a, S r, B a ) are group 2 metals. Which of these will form ions most readily? A. ( B e ) в. ( M g ) ( c cdot S r ) D. ( B a ) |
11 |
1130 | Which of the following is not s-block element? В. ( 1 s^{2} 2 s^{2} 2 p^{1} ) c. ( 1 s^{2} 2 s^{1} 2 p^{1} ) D・ ( [A r] 4 s^{1} 4 p^{1} ) |
11 |
1131 | elements (i.e., s and of representative NO 0.33 First member of each group of representative elements p-block elements) shows anomalous behaviour. Illustrate w examples. nntntiin niomonts tie s- and p-block elements) |
11 |
1132 | Atomic numbers of few elements are given below. Which of the pairs belongs to s-block? A . 7,14 B. 3,20 c. 8,15 D. 9,17 |
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1133 | The elements posses stable electronic configuration are called as A. Transition metals B. Non-transition metals c. Noble gases D. None of these |
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1134 | Identify the correct sets of entries that are rightly matched. Column A |
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1135 | The period of element with atomic number 20 in the periodic table is : ( mathbf{A} cdot mathbf{1} ) B. 2 ( c cdot 3 ) ( D ) |
11 |
1136 | The modern periodic table is most ( _{text {一一一一一一一一一 }} ) form of periodic table. A . insignificant B. Significant c. Both A and B D. None of these |
11 |
1137 | 2. Which of the following oxides is neutral? (a) Sno (b) CO (c) A1, (d) Na,o |
11 |
1138 | Significance of classification of periodic table is to A. predict the blocks of elements B. predicts the groups of elements c. both A and B D. none of these |
11 |
1139 | Modern periodic table has periods. A. 7 B. 8 ( c cdot 6 ) ( D ) |
11 |
1140 | Electronic configuration ( boldsymbol{O} ) is: A ( cdot[H e] 2 s^{2} 2 p^{4} ) B . ( [H e] 2 s^{3} 2 p^{4} ) ( mathbf{c} cdot[H e] 2 s^{2} 2 p^{5} ) D cdot ( [H e] 3 s^{2} 2 p^{4} ) |
11 |
1141 | The chemical properties of the elements of matter have been found to repeat is regular patterns. This pattern can be seen in the arrangement of atoms in the: A. nutrition table B. calculus table c. periodic table D. chemical table |
11 |
1142 | Atomic number ( _{-1-}-_{-1} ) by one unit on moving from right to left. A. increases B. decreases c. remains the same D. None of the above |
11 |
1143 | An element ‘X’ with atomic number 114 has recently been discovered. Its IUPAC name is: A. Eka-lead B. Ununfortium c. Ununquadium D. Bohrium |
11 |
1144 | The chemical formula of the oxide of Eka – aluminium is: A. ( G a O ) в. ( G a O_{2} ) c. ( G a_{2} O_{2} ) D. ( G e_{2} O_{3} ) |
11 |
1145 | The unit of electron affinity is: A. kcal/mole B. erg-sec ( c cdot A^{c} ) D. no unit |
11 |
1146 | Which one of the following is least chemically reactive? ( A cdot A r ) B. ( c cdot s ) D. Ti E. |
11 |
1147 | Which of the following group bear maximum number of elements? ( mathbf{A} cdot 3^{r d} ) group B. ( 2^{n d} ) group c. ( 18^{text {th }} ) group D. ( 13^{text {th }} ) group |
11 |
1148 | Arrange the following elements in terms of increasing first ionization energy: ( boldsymbol{G} boldsymbol{a}, boldsymbol{B} boldsymbol{a}, boldsymbol{R} boldsymbol{u}, boldsymbol{F}, boldsymbol{N} ) A. ( B a<R u<G a<N<F ) в. ( G a<B a<R u<F<N ) c. ( R u<B a<G a<N<F ) D. None of the above |
11 |
1149 | Atomic number 56 belongs to which block ? ( A ) B. ( p ) ( c cdot d ) D. ( f ) |
11 |
1150 | Two elements A and B have the following configuration: ( boldsymbol{A}: mathbf{2}, mathbf{7} ; boldsymbol{B} ) ( 2,8,7 . ) Both of them belong to: A. the same group and are chemically similar B. different groups but are chemically similar C. the same group but are chemically dissimilar D. the same period and are chemically similar |
11 |
1151 | The diagram shows some parts of the periodic table with few elements. Identify the set of two elements which combine together to form a covalent compound with a formula of the type ( boldsymbol{X} boldsymbol{Y}_{3} ) A ( cdot 2 ) and 3 B. 4 and 6 ( c .5 ) and 7 D. 1 and 7 |
11 |
1152 | The classification of elements in the modern periodic table is based on their: A. increasing order of their atomic number B. atomic weight c. atomic volume D. equivalent weight |
11 |
1153 | ( 4^{t h} ) period ends with : A . argon B. neon c. krypton D. radon |
11 |
1154 | Element P has atomic number 19. To which group does P belongs to? ( mathbf{A} cdot mathbf{1} ) B. 2 ( c cdot 17 ) ( D cdot 16 ) |
11 |
1155 | Which of the following statement about Mendeleev’s periodic table is incorrect? A. He leftgaps for some elements which were discovered later and correctly predicted the properties of them B. Inert gases could be placed in a new group without disturbing the existing order C. He arranged the elements according to the properties of elements D. The properties of the elements are the periodic function of their atomic numbers |
11 |
1156 | Among cellulose, polyvinyl chloride, nylon and natural rubber, in which of the polymer intermolecular force of attraction is weakest? A. Nylon B. Polyvinyl chloride c. cellulose D. Natural rubber |
11 |
1157 | Which of the following elements shown as pairs with their atomic numbers belong to the same period? A. ( Z=19 ) and ( z=38 ) B. ( Z=12 ) and ( Z=17 ) C ( . quad Z=11 ) and ( Z=21 ) D. ( z=16 ) and ( z=35 ) |
11 |
1158 | DU ) CU 012. Define ionisation enthalpy. |
11 |
1159 | Out of sodium, chlorine and silicon which one is metalloid? |
11 |
1160 | The long form of the periodic table is based on : A. number of electrons B. mass of the atoms c. electronegativity D. shape of the atom |
11 |
1161 | Compared to the first ionization potential, the value of second ionization potential of an element is: A. Negligible B. Smaller c. Greater D. Double |
11 |
1162 | Q17. Define electronegativity. How does it differ from electron gain enthalpy? | 11 |
1163 | Anything that influences the valence electrons will affect the chemistry of the element. Nuclear mass effects chemistry of valence electrons. A. True B. False |
11 |
1164 | Which is inert gas? ( A cdot 1 ) B. 2 ( c cdot 3 ) D. 4 |
11 |
1165 | Assertion Newland’s law of octaves of elements is a function of their state that the property of every eighth element is the repetition of the first. Reason In order to fit new elements into his table Newland adjusted two elements in the same colum. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion. B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion C. Assertion is correct but Reason is incorrect. D. Assertion is incorrect but Reason is correct. |
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1166 | The electronic configuration with the highest ionization enthalpy is: A ( cdot[N e] 3 s^{2} 3 p^{1} ) B ( cdot[A r] 3 d^{10} 4 s^{2} 4 p^{3} ) ( mathbf{c} cdot[N e] 3 s^{2} 3 p^{3} ) D. ( [N e] 3 s^{2} 3 p^{2} ) |
11 |
1167 | The screening effect of ( boldsymbol{d} ) electrons is: A. much less than ( s ) -electrons B. much more than ( s ) -electrons c. equal to ( s ) -electrons D. equal to ( p ) -electrons |
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1168 | Which of the following statements is true regarding the typical element belonging to ( 1^{s t} ) group of ( p ) – block elements?
This question has multiple correct options |
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1169 | The modern periodic table explains the periodicity of the properties of the elements and relates them to their: A. Charge B. Electron number c. Electronic configuration D. Atomic mass |
11 |
1170 | Which element among those listed below, has the lowest electronegativity? A ( . M g ) в. ( C a ) ( c . B a ) D. ( S r ) E . ( B e ) |
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