We provide periodic classification of elements practice exercises, instructions, and a learning material that allows learners to study outside of the classroom. We focus on periodic classification of elements skills mastery so, below you will get all questions that are also asking in the competition exam beside that classroom.
List of periodic classification of elements Questions
| Question No | Questions | Class |
|---|---|---|
| 1 | Largest atomic size is: A. в. ( c . F ) D. | 10 |
| 2 | Due to its semiconductor properties, the element used in computers, ( T V ), etc. is : A. carbon B. silicon c. bromine D. fluorine | 10 |
| 3 | Which of the following element has the least metallic character? A. ( C ) B. ( S ) i c. ( G e ) D. ( S n ) | 10 |
| 4 | ( X, Y ) and ( Z ) are three elements in the third period. X reacts with chlorine to give a liquid product. Y reacts with chlorine to give a solid product that dissolves in water to give a solution of ( mathrm{pH} 7 ) z reacts with chlorine to give a solid product that dissolves in water to give a solution of ( mathrm{pH} 6 ) Which elements are good conductors of electricity? A. ( x ) and ( Y ) B. Y and Z c. Y only D. Zonly | 10 |
| 5 | Which one is the descending order of atomic radius of elements of third period? ( N a(z=11), M g(z=12), A l(z=13) ) and ( boldsymbol{S} boldsymbol{i}(boldsymbol{z}=mathbf{1 4}) ) A. ( S i>A l>M g>N a ) в. ( N a>M g>A l>S i ) c. ( N a<M gS i ) D. ( N a>A l>M g=S i ) | 10 |
| 6 | Define non-metallic character. ( A . ) An atom is said to be a non-metal if it loses one or more electrons when supplied with energy B. An atom is said to be a non-metal if it loses only one electron when supplied with energy C. An atom is said to be a non-metal if it gains one or more electrons when supplied with energy D. An atom is said to be a non-metal if it gains only one electron when supplied with energy | 10 |
| 7 | Increasing electropositive character: ( boldsymbol{A l}<boldsymbol{M} boldsymbol{g}<boldsymbol{N} boldsymbol{a} ) If true enter 1 , else enter 0 . ( A ) | 10 |
| 8 | The density of solid argon is 1.65 g per ( mathrm{cc} ) at ( -233^{circ} mathrm{C} ). If the argon atom is assumed to be a sphere of radius ( 1.54 times 10^{-8} mathrm{cm}, ) the percentage of empty space in solid argon is: A . 32% B. 54% c. ( 68 % ) D. 62% | 10 |
| 9 | Calculate the number of moles in (i) ( 8 g ) of oxygen atoms (ii) ( 4.088 times 10^{21} ) number of oxygen atoms (Atomic mass of ( boldsymbol{O}=mathbf{1 6} boldsymbol{u}) ) | 10 |
| 10 | Which element has the most metallic character? A. Boron B. Aluminium c. Indium D. Thallium | 10 |
| 11 | Which of the following anions is most easily polarized? A ( cdot C l ) B. ( S e^{2} ) c. ( B r^{-} ) D. ( T e^{2} ) | 10 |
| 12 | The stability of ferric ion is due to A. half filled f-orbitals B. half filled d-orbitals C. completely filled f-orbitals D. completely filled d-orbitals | 10 |
| 13 | The atom of largest size is: A . B. At ( c ) D. Be | 10 |
| 14 | Match the correct atomic radius with the element: ( begin{array}{ll}text { Element } & text { Atomic radius }(mathrm{pm}) \ text { (a) } B e & text { (p) } 74 \ text { (b) } C & text { (q) } 88 \ text { (c) } O & text { (r) } 111 \ text { (d) } B & text { (s) } 77 \ text { (e) } N & text { (t) } 66end{array} ) | 10 |
| 15 | Compare metallic character of following: ( boldsymbol{S} boldsymbol{e}, boldsymbol{A} boldsymbol{s} ) | 10 |
| 16 | The atomic radius decreases in a period due to : A. increase in nuclear attraction B. decrease in nuclear attraction c. increase in number of electrons D. decrease in number of electrons | 10 |
| 17 | Which of the following has the smallest size ? ( mathbf{A} cdot I^{-} ) B. ( S^{2-} ) ( c cdot O^{2} ) D. ( C l ) | 10 |
| 18 | Select correct statement. A. Across a transition series (from Cr to CO), there is only a small decrease in atomic radius from one element to another due to very small increase in effective nuclear charge B. The rate of decrease in the size across the lanthanide series is less than the across the first transition series C. Both A and B are correct statements D. Both ( A ) and ( B ) are incorrect statements | 10 |
| 19 | The diameter of zinc atom is ( 2.6 A ) Calculate (a) radius of zinc atom in pm and (b) number of atoms present in a length of ( 1.6 mathrm{cm} ) if the zinc atoms are arranged side by side lengthwise. | 10 |
| 20 | Which of the following elements has the least non-metallic character? A. Fluorine B. Chlorine c. Bromine D. lodine | 10 |
| 21 | A very slight decrease in atomic radius occurs in a transition series when compared with that in a representative series. This is due to: A. shielding effect B. penetrating effect c. inert pair effect D. bonding nature | 10 |
| 22 | Atomic number of an element is 16 . What is the nature of the element? A . Alkali metal B. Transition metal c. Non metal D. Halogen | 10 |
| 23 | How does the metallic character vary across the period? Explain. | 10 |
| 24 | Justify the following with suitable reasons: Size of the atom increases as we move down the group. | 10 |
| 25 | Assertion Atom with large atomic radii and low ionisation potential are more metallic in nature. Reason Atom with large atomic radii and low ionisation potential have tendency to loose electron 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 | 10 |
| 26 | The most non-metallic element among the following is: A. B. ( c cdot 0 ) D. c | 10 |
| 27 | What is the correct order of size of ( mathrm{Pd} ) ( mathrm{Pt}, ) Ni? | 10 |
| 28 | The most electropositive element is : A . ( C s ) в. ( C ) c. ( C l ) D. ( K ) | 10 |
| 29 | The atomic radius of ( A g ) is closed to : A. ( C u ) в. ( H g ) c. ( N i ) D. ( A u ) | 10 |
| 30 | All are non-metals except: ( mathbf{A} cdot ) hydrogen ( left(H_{2}right) ) and carbon (C) B. potassium (K) C. inert gases (helium, neon and argon) D. sulphur (S), phosphorus (P), and fluorine (F) | 10 |
| 31 | Atomic radius goes on decreasing while going from left to right in a period | 10 |
| 32 | Sodium [Na] and Sulphur [S] both are present in third period of modern periodic table. Which is more metallic and why? | 10 |
| 33 | Among the elements ( B, M g, A l ) and ( K ) the correct order of increasing metallic character is: A. ( B<A l<M g<K ) в. ( B<M g<A l<K ) c. ( M g<B<A l<K ) D. ( M g<A l<B<K ) Е. ( K<M g<A l<B ) | 10 |
| 34 | Metallic nature increases moving down the group because: A. nuclear’charge decrease B. shielding increases (B) both ( c cdot(A) ) and D. none of these | 10 |
| 35 | Elements with low electronegativity are usually non-metallic. A. True B. False | 10 |
| 36 | Arrange the following in increasing order of radii: a) ( boldsymbol{I}, boldsymbol{I}^{+}, boldsymbol{I}^{-} ) ( mathbf{b}) C, N, boldsymbol{S} boldsymbol{i}, boldsymbol{P} ) | 10 |
| 37 | The atomic size refers to: A. diameter of an atom. B. radius of an atom. C. size of two atoms in a molecule. D. none of the above. | 10 |
| 38 | Which of the following ( N^{3-}, O^{2-}, F^{-} ) is largest in size? A ( cdot N^{3} ) B. ( O^{2} ) ( c cdot F^{-} ) D. All of these | 10 |
| 39 | Which element has highest electronegativity? A. в. не c. Ne D. Na | 10 |
| 40 | Identify the incorrect order in terms of atomic radii. ( mathbf{A} cdot N^{3-}>P^{3} ) B. ( O^{2-}>F^{-} ) ( mathrm{c} cdot mathrm{Ca}^{2+}>mathrm{Sr}^{2} ) D ( cdot S^{-}>S^{2-} ) E ( . S^{2-}>O^{-} ) | 10 |
| 41 | Which of the following statement is incorrect? A. Non-metals are electro-positive in nature B. Metals are electro-positive in nature C. Metals are present on the left hand side of the periodic table D. Non-metals are present on the right hand side of the periodic table | 10 |
| 42 | Fill in the blanks with the appropriate words in each case Element ‘Z’ in a sub-group 2[II A] is below element ‘Y’ in the same sub- group.The element ‘Z’ will be expected to have atomic size and metallic character than ( y ) A. lower, more B. lower, less c. higher, more D. higher, less | 10 |
| 43 | Which of the following elements will have maximum metallic characteristic? A . Ga B. Ge c. As D. se | 10 |
| 44 | The correct order of radii is: ( mathbf{A} cdot L i<B e<M g ) B ( cdot B e^{+2}<L i^{+}<H^{-} ) ( mathbf{C} cdot M n^{3+}<M n^{2+}C l^{-}>S^{2-} ) | 10 |
| 45 | Assertion Atomic sizes of ( C s ) and ( F r ) are almost similar. Reason Cs and Fr belong to same group. 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 | 10 |
| 46 | Which of the following is smallest in size? A ( cdot O^{2} ) B. ( C^{4} ) ( c cdot F^{-} ) D. ( N^{3} ) | 10 |
| 47 | Which of the following choices both show the correct order of elements by increasing atomic radius AND by increasing ionization energy? A. ( A l, S, C l ) and ( A l, S, C l ) в. ( A l, S, C l ) and ( C l, S, A l ) c. ( C l, S, A l ) and ( C l, S, A l ) D. ( C l, S, A l ) and ( A l, S, C l ) | 10 |
| 48 | On moving from left to right across a period in the table, the metallic character: A . increases B. decreases c. remains constant D. first increases and then decreases | 10 |
| 49 | With the increase in size of a group: A. metallic character decreases B. metallic character increases C . chemical reactivity decreases D. chemical reactivity remains same | 10 |
| 50 | Which of the following group of elements has the same size? A. ( S e, V, M n ) в. ( M n, ) Fe, Со c. ( T i, V, C r ) D. ( L i, B e, B ) | 10 |
| 51 | Which of the following elements will form an acidic oxide? A. An element with atomic number 7 B. An element with atomic number 3 C. An element with atomic number 12 D. An element with atomic number 19 | 10 |
| 52 | 43. In the periodic table of elements, on moving from left to right across a period, the atomic radi- us (1) decreases (2) increases (3) remains unchanged (4) does not follow a definite pat- tern | 10 |
| 53 | Which of the following has metallic as well as non-metallic character? (i) Arsenic (ii) Antimony (iii) Lead ( A cdot( ) i) only B . (ii) only c. (i) and (ii) only D. (i), (ii) and (iii) | 10 |
| 54 | The radius of which ion is closet to that of ( L i^{+} ) ion? A ( . N a^{+} ) B. ( B e^{2} ) c. ( M g^{2+} ) D. ( A l^{3} ) | 10 |
| 55 | Which of the following set of elements is written in order of their increasing metallic character? A. ( B e<M g<C a ) в. ( N a<L i<K ) с. ( M g<A l< ) S ( i ) D. ( C<O<N ) N | 10 |
| 56 | What are metals? | 10 |
| 57 | Which of the following is a non-metal? A . Ge B. As c. ( T ) e D. se | 10 |
| 58 | Arrange the following in increasing order of their atomic radii. ( mathrm{Li}, mathrm{Be}, mathrm{Ne}, mathrm{C}, mathrm{B} ) A. ( N e<C<B<B eN e>C>B>B e ) c. ( N e>C>B>B e>L i ) D. ( L i>N e>B>C>B e ) | 10 |
| 59 | The correct order for decreasing atomic radius of the five atoms ( boldsymbol{H}, boldsymbol{B r}, boldsymbol{I}, boldsymbol{H} boldsymbol{e} ) and ( S ) is : A ( . I>B r>S>H e>H ) В. ( I>S>B r>H>H e ) c. ( I>S>B r>H e>H ) D. ( B r>I>S>H e>H ) | 10 |
| 60 | Which of the following electronic configuration corresponds to the most electropositive character? A ( cdot[H e] 2 s^{1} ) B . ( [H e] 2 s^{2} ) ( c cdot[X e] 6 s^{1} ) D. ( [X e] 6 s^{2} ) | 10 |
| 61 | Which of the following statements is true? A. Cations are smaller in size than neutral atoms. B. Horizontal rows in the table are called periods. C. On going across the periods atomic size of the element decreases. D. All to the above | 10 |
| 62 | The covalent and Van der walls radii of chlorine respectively are: ( mathbf{A} cdot 1.80 A^{circ} & 0.99 A^{circ} ) B. ( 0.99 A^{circ} ) & ( 1.80 A^{circ} ) ( mathbf{C} cdot 1.80 A^{circ} & 1.80 A^{circ} ) D. ( 0.99 A^{circ} ) & ( 0.99 A^{circ} ) | 10 |
| 63 | The most metallic element among the following is : A. ( P ) в. ( A s ) ( c . B i ) D. ( S b ) | 10 |
| 64 | Fill in the blanks by selecting the correct word from the brackets: (i) If an element has a low ionization energy then it is likely to be (metallic / non metallic). (ii) If an element has seven electrons in its outermost shell then it is likely to have the ( _{–}-_{–}- ) (largest / smallest) atomic size among all the elements in the same period. | 10 |
| 65 | Amongst the elements ( mathrm{B} ), Al, ( mathrm{C} ) and ( mathrm{Si} ), the element having most metallic character is: ( A cdot A ) B. ( c . ) в D. si | 10 |
| 66 | Considering the element ( B, A l, M g ) and ( K, ) write the correct order of their metallic character. | 10 |
| 67 | The order not in accordance with the property mentioned is ? ( mathbf{A} cdot L i<N a<KN>O>C ) – ionisation enthalpy c. ( S i<P<S<C l ) – electronegativity D. ( F<C l<B r<I ) – electronegativity | 10 |
| 68 | Consider the following statements and arrange in the order of true/ false as given in the codes. ( boldsymbol{S}_{1}: ) Metals comprises less than ( 78 % ) of all known elements and appear on the left side of the periodic table. ( S_{2}: ) Silicon, germanium, arsenic, antimony, selenium and tellurium all are semi-metals. ( boldsymbol{S}_{3}: ) The following order represents the correct increasing order of metallic character; ( boldsymbol{P}<boldsymbol{S} boldsymbol{i}<boldsymbol{B} boldsymbol{e}<boldsymbol{M} boldsymbol{g}<boldsymbol{N} boldsymbol{a} ) A. FFT в. ( pi ) c. FTF D. TT | 10 |
| 69 | The atomic radius of hydrogen atom is: ( A cdot 25 mathrm{pm} ) B. 30 pm c. ( 53 mathrm{pm} ) D. ( 43 mathrm{pm} ) | 10 |
| 70 | Name the element that first shows some visible metallic properties at room temperature A. Fluroine B. Chlorine c. Bromine D. lodine E. Astatine | 10 |
| 71 | Define atomic size. Give its unit of measurement. In the modern periodic table what trend is observed in the atomic radius in a group and a period and why is it so? | 10 |
| 72 | Atomic radius is measured by: A. Rutherfords ( alpha ) -ray scattering experiment B. X-ray diffraction technique C. Millikan’s oil drop method D. Thomsons water-melon model | 10 |
| 73 | Which of the following is an intensive property? A. Temperature B. Viscosity c. Surface tension D. All of these | 10 |
| 74 | Assertion Atomic size decreases across period but increases down a group of the periodic table. Reason Moving from left to right across a period, electrons are added one at a time to the outer energy shell. Electrons within a shell cannot shield each other from the attraction to protons, while moving down a group in the periodic table, the number of electrons and filled electron shells increases. 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 | 10 |
| 75 | Metallic character goes on decreasing while going from left to right in a period. A. True B. False | 10 |
| 76 | Metals can produce sound when struck, this property of metals is known as sonority. A. True B. False | 10 |
| 77 | The order of size is: A. ( S^{2-}>C l^{-}>O^{2-}>F^{-} ) B. ( C l^{-}>S^{2-}>O^{2-}>F^{-} ) c. ( S^{2-}>O^{2-}>C l^{-}>F^{-} ) D. ( S^{2-}>O^{2-}>F^{-}>C l^{-} ) | 10 |
| 78 | Which of the following has the smallest size ? ( mathbf{A} cdot I^{-} ) B. ( S^{-2} ) c. ( O^{-2} ) D. ( C l ) | 10 |
| 79 | The correct order for decreasing atomic radius of the five atoms ( mathrm{H}, mathrm{Br}, mathrm{I}, mathrm{He} ) and Sis? ( A cdot mid>B r>S>H e>H ) ( mathbf{B} cdot mid>S>B r>H>H e ) ( mathrm{c} cdot mid>mathrm{S}>mathrm{Br}>mathrm{He}>mathrm{H} ) ( mathbf{D} cdot mathbf{B r}>mid>mathbf{S}>mathrm{He}>mathbf{H} ) | 10 |
| 80 | On passing ( 0.5 mathrm{F} ) of electricity through molten sodium chloride, sodium deposited at cathode will be A . ( 29.25 g ) в. ( 11.50 g ) c. ( 58.50 g ) D. ( 0.00 g ) | 10 |
| 81 | Increasing order of metallic characteristic of ( mathrm{C}, mathrm{Sb}, mathrm{As}, mathrm{Bi}, ) Si is shown by : A. ( c, ) si, ( A s, ) sb, Bi B. ( C, ) Si, Bi, Sb, As c. ( c, ) si ( , ) sb, Bi, As D. ( c, ) si, As, Bi, Sb | 10 |
| 82 | The correct order of decreasing metallic character is: ( mathbf{A} cdot C l>S i>A l>M g>N a ) В ( . N a>M g>A l>S i>C l ) ( mathbf{c} . N a>A l>M g>C l>S i ) D. ( A l>N a>S i>C l>M g ) | 10 |
| 83 | Four elements ( A, B, C ) and ( D ) have atomic numbers 12,13,14 and 15 respectively Which of them will have largest atomic radii? | 10 |
| 84 | Which of the following electronic configuration represents a highly electropositive element? A ( cdot[H e] 2 s ) B ( cdot[X e] 6 s^{1} ) ( mathbf{C} cdot[H e] 2 s^{2} ) D ( cdot[X e] 2 s^{2} ) | 10 |
| 85 | The atomic radii of the elements across the second period of ihe periodic table: A. decrease due to increase inatomic number B. decrease due to increase in effective nuclear charge C. decrease due to increase in atomic weights D. increase due to increase in the effective nuclear charge | 10 |
| 86 | Which of the following is the correct order of relative sizes? ( mathbf{A} cdot I^{-}>I^{+}>I ) B . ( I^{-}>I>I^{+} ) C ( cdot I>I^{+}>I^{-} ) D. ( I^{+}>I^{-}>I ) | 10 |
| 87 | Which of the following element has the smallest atomic radius? ( mathbf{A} cdot K ) в. ( C a ) ( c . B r ) D. ( K r ) E. ( Z n ) | 10 |
| 88 | Among the following metals which one has the least metallic character? ( A cdot B e ) в. ( M g ) ( c . C a ) D. ( S r ) | 10 |
| 89 | In the periodic table, the metallic character of element: A. decreases from left to right across a period and on descending a group B. decreases from left to right across a period and increases on descending a group C. increases from left to tight across a period and on descending a group D. increases from left to right across a period and decreases on descending a group | 10 |
| 90 | Out of ( boldsymbol{F} boldsymbol{e}^{2+}, boldsymbol{F} boldsymbol{e}^{3+}, boldsymbol{M} boldsymbol{n}^{2+} ) and ( boldsymbol{T} boldsymbol{i}^{2+}, ) the least size is of: ( mathbf{A} cdot M n^{2+} ) B. ( T i^{2} ) ( mathrm{c} cdot F e^{2} ) D. ( F e^{3} ) | 10 |
| 91 | Which of the following element is most electropositive? ( mathbf{A} cdot H ) в. ( M g ) ( c . C a ) D. ( S ) i | 10 |
| 92 | Assertion Atomic size decreases in a period due to increase of atomic number. Reason The nuclear charge is increasing and size of valence shell remains same as we move from left to right. Hence, in any period, the atomic size of the element decreases from left to right. 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 | 10 |
| 93 | Element ‘X’ in period 3 has high electron affinity and electronegativity. It is likely to be a A . alkali metal B. alkaline metal c. transition metal D. non-metal | 10 |
| 94 | An element has cubic close packed structure. The distance between adjacent layers is 424.2 pm. What would be the atomic radius of the element? A. ( 259.8 mathrm{pm} ) В. ( 346.4 mathrm{pm} ) c. ( 529.8 mathrm{pm} ) D. ( 644.3 mathrm{pm} ) | 10 |
| 95 | Which of the following orders are Correct? A. ( A g C l>A g F: ) Covalent character order B ( cdot B a O>B a F_{2}: ) Melting point order ( mathbf{C} cdot B e F_{2}>B a F_{2}: ) Solubility order D. ( L i N O_{3}<R b N O_{3}: ) Thermal stability order | 10 |
| 96 | ( K^{+} ) and ( F^{-} ) have identical radius about 1. 34 A. What should be the atomic radius of ( K ) and ( F ) atoms? | 10 |
| 97 | The correct order according to size is A ( cdot O>O^{-}>O^{2-} ) В. ( O^{-}>O^{2-}>O ) c. ( O^{2-}>O^{-}>O ) D. ( O>O^{2-}>O^{-} ) | 10 |
| 98 | Out of ( mathrm{H}, mathrm{C} ) and ( mathrm{F} ) which has largest atomic size? | 10 |
| 99 | Among the elements of the second period pick out the element which has a smallest atomic radius. A. ( F ) в. ( L ) i ( c . c ) D. Ne | 10 |
| 100 | Non-metallic character down the group. A. increases B. decreases c. constant D. none of these | 10 |
| 101 | Nuclear charge with decrease in atomic number. A. increases B. decreases c. remains same D. increases then decreases | 10 |
| 102 | Most metallic element in the fifth period is? A . silver B. rubidium c. gold D. rhodium | 10 |
| 103 | Because of lanthanoid contraction, which of the following pairs of elements have nearly same atomic radii? (Numbers in the brackets are atomic numbers) A ( . quad Z r(40) ) and ( N b(41) ) B. ( Z r(40) ) and ( H f(72) ) c. ( Z r(40) ) and ( T a(73) ) D. ( T i(22) ) and ( Z r(40) ) | 10 |
| 104 | Which of the following is more nonmetallic element from the elements ‘X’ and ‘Y’ having electronic configurations 2,8,5 and 2,8,6 respectively? A. ( x ) B. Y c. Both have same non-metallic character D. None of the above | 10 |
| 105 | Which of the following has the largest size? ( mathbf{A} cdot R b^{-} ) В. ( M g^{+2} ) ( mathbf{c} cdot L i^{+} ) D. ( B a^{+2} ) | 10 |
| 106 | Among ( (a) N a_{2} O ) ( (b) M g O,(c) A l_{2} O_{3} ) ( (d) P_{2} O_{5} ) the most basic, most acidic and amphoteric oxide can be respectively: ( A cdot a, b, c ) B. b, e, c ( c cdot a, e, c ) ( D cdot e, c, a ) | 10 |
| 107 | With an increase in atomic number in a period : A. metallic character decreases B. metallic character increases c. chemical reactivity decreases D. chemical reactivity increases | 10 |
| 108 | The radius of potassium atom is 0.203 nm. The radius of the potassium ion in nano-meter will be: ( mathbf{A} cdot 0.133 ) B. 0.231 c. 0.234 D. 0.251 | 10 |
| 109 | Which of the following sequence of explanation is appropriate for explaining the reason for the periodicity of reducing property in a period or group? (a) Tendency to undergo oxidation decreases in a period and increases in a group. (b) In a period ionization energy increases and in a group it decreases. (c) In a period the atomic size decreases and in a group it increases. (d) The elements present in the left side of the periodic table have strong reducing property. ( A cdot cos a ) B. c d b a ( c cdot d c a b ) D. ( d ) b a c | 10 |
| 110 | For what type of ions the ionic radius is less than the atomic radius? | 10 |
| 111 | The ( C-C ) and ( S i-C ) inter-atomic distance are ( 154 p m ) and ( 188 p m ). the atomic radius of ( boldsymbol{S} boldsymbol{i} ) is: ( mathbf{A} cdot 77 p m ) B . 94 pm ( c .114 p m ) D. ( 111 p m ) | 10 |
| 112 | Carbon: non-metal:: Germanium: A . Metal B. Non-metal c. Metalloid D. Liquid non-metal | 10 |
| 113 | Define Atomic radii, covelentradii metallic radii? | 10 |
| 114 | Which one of the following is smallest in size ? A . ( N^{-3} ) B. ( O^{-2} ) ( c cdot F^{-} ) D. ( N a^{text {t }} ) | 10 |
| 115 | Which one is the base: ( C s O H ) or ( H B r ) ? A. ( C s O H ) в. НВт c. Both ( A ) and ( B ) D. None of the above | 10 |
| 116 | Which of the following statements is incorrect? A. Generally the radius trend and the ionization energy trend across a period are opposites. B. Metallic and covalent radii of potassium are ( 2.3 A^{circ} ) and ( 2.03 A^{circ} ) respectively. C. Amongst ( L i^{-}, B e^{-}, B^{-} ) and ( C^{-}, L i^{-} ) is least stable ion. D. Atomic and ionic radii of Niobium and Tantalum are almost same. | 10 |
| 117 | The correct order of the atomic radii of ( mathrm{C}, mathrm{Cs}, mathrm{Al} ) and ( mathrm{S} ) is : ( A cdot S<C<A mid<C S ) B. ( s<c<c s<A l ) ( c cdot c<s<c s<A ) D. ( c<S<A mid<C ) s | 10 |
| 118 | Atomic radii of Flourine and Neon in Angstorm units are given by? A. 0.72,1.60 в. 1.60,1.60 c. 0.72,0.72 D. None of these | 10 |
| 119 | Atomic radius of which element has the least value in ( 2^{n d} ) period? A. Hydrogen B. Florine c. Neon D. Helium | 10 |
| 120 | Among the following pairs, the one containing examples of metalloid elements in the periodic table is: ( mathbf{A} cdot N a ) and ( K ) B. ( F ) and ( C l ) c. ( C u ) and ( A g ) D. ( B ) and ( S i ) | 10 |
| 121 | The ground state electronic configurations of the elements, U, ( mathrm{V}, mathrm{W} ) ( x ) and ( Y ) (these symbols do not have any chemical significance) are as follows: U ( 1 s^{2} 2 s^{2} 2 p^{3} ) ( 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{1} ) W ( 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{2} ) ( 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{5} 4 s^{2} ) ( Y 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{10} 4 s^{2} 4 p^{6} ) Determine which sequence of elements satisfy the following statements: (i) Element forms a carbonate which is not decomposed by heating (ii) Element is most likely to form coloured ionic compounds (iii) Element has largest atomic radius (iv) Element forms only acidic oxide A. vw y u в. ( vee times Y ) w c. ( v ) w ( Y x ) D. ( v times w u ) | 10 |
| 122 | Within a group of the periodic table as one goes from downward to upward, the metallic character: A . decreases B. increases c. first increases then decreases D. does not change | 10 |
| 123 | Which one of the following oxides is neutral? A . ( c o ) B. ( operatorname{sn} O_{2} ) ( c cdot z n 0 ) ( D cdot sin _{2} ) | 10 |
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