We provide the d-and f-block elements practice exercises, instructions, and a learning material that allows learners to study outside of the classroom. We focus on the d-and f-block elements skills mastery so, below you will get all questions that are also asking in the competition exam beside that classroom.
List of the d-and f-block elements Questions
| Question No | Questions | Class |
|---|---|---|
| 1 | Why are ( M n^{2+} ) compounds more stable than ( F e^{2+} ) towards oxidation to their +3 state? |
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| 2 | Maximum oxidation state is shown by which pair of elements? A ( . N p, P u ) в. ( C f, B k ) c. ( N p, ) Pr D. ( A c, T h ) |
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| 3 | What is tailing of Mercury? | 12 |
| 4 | ine 45 When orange solution containing Cr 03-ion is treated with an alkali, a vellow solution is formed and when H+ ions are added to yellow solution, an orange solution is obtained. Explain why does this happen? |
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| 5 | What do you observe when water droplets fall on blue cobalt chloride? | 12 |
| 6 | is a metal that exist as a liquid at room temperature | 12 |
| 7 | Q. 14 The pair of ions having same electronic configuration is .. (a) Cr3+, Fe3+ (b) Fe3+, Mn2+ + (c) Fe3+, CO3+ (d) Sc3+, Cr3+ |
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| 8 | To which of the following series the transition element from ( Z=39 ) to ( Z=48 ) belong. ( A cdot 3 d ) series B. ( 4 d ) series c. ( 5 d ) series D. ( 6 d ) series |
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| 9 | The hardness, melting point and boiling point of elements increase from Ce to Lu because: A. the attraction between the atoms increases as the size increases B. the attraction between the atoms decreases as the size increases c. the attraction between the atoms increases as the size decreases D. the attraction between the atoms remains the same as the size increases |
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| 10 | Which of the following transition element shows the highest oxidation state? ( mathbf{A} cdot M n ) в. ( F e ) ( c cdot V ) D. ( C r ) |
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| 11 | Which of the following belongs to actinoid series of elements? A. Nd B. ( c . mathrm{sm} ) D. Al |
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| 12 | Q. 14 Interstitial compounds are formed when sm compounds are formed when small atoms are trapped inside stal lattice of metals. Which of the following is not the characteristic property of interstitial compounds: (a) They have high melting points in comparison to pure metals (b) They are very hard (c) They retain metallic conductivity (d) The are chemically very reactive |
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| 13 | Which compound is volatile on heating? A. ( M g C l_{2} ) в. ( mathrm{HgCl}_{2} ) c. ( Z n C l_{2} ) D. none of these |
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| 14 | Transition elements have high MP & BP due to: A. use of ns electrons B. use of (n-1)d electrons only c. both ns and (n-1)d electrons D. use of np electrons |
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| 15 | The landthanide contraction is responsible for the fact that: A. ( Z r ) and ( Y ) have almost the same radius. B. ( Z r ) and ( N b ) have similar oxidation state c. ( Z r ) and ( H f ) have almost the same radius D. ( Z r ) and ( Z n ) have the same oxidation state. |
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| 16 | Platinum, Palladium and Iridium are called noble metals because: A. Alfred Nobel discovered them B. they are shining lustrous and pleasing to look at C. they are found in native state D. they are inert towards many common reagents |
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| 17 | Question 7. What is lanthanoid consequences of lanthanoid contraction contraction? What are the |
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| 18 | Chromium seem to be less reactive than estimated from its standard reduction potential value because of formation of oxide layer. If true enter 1 , else enter 0 |
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| 19 | Which of the following ions is a good oxidising agent? ( A cdot E u^{2} ) B. ( mathrm{ce}^{4} ) ( c cdot y b^{2} ) D. ( mathrm{Sm}^{2+} ) |
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| 20 | State whether the given statement is true or false:
Copper metal reduces ( F e^{2+} ) in an acid |
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| 21 | The outer electron configuration of Gd (Atomic No.64) is: ( mathbf{A} cdot 4 mathrm{f}^{3} 5 mathrm{d}^{5} 6 mathrm{s}^{2} ) B ( cdot 4 mathrm{f}^{4} 5 mathrm{d}^{0} 6 mathrm{s}^{2} ) C ( cdot 4 mathrm{f}^{2} 5 mathrm{d}^{4} 6 mathrm{s}^{2} ) D. ( 4 mathrm{f}^{7} 5 mathrm{d}^{1} 6 mathrm{s}^{2} ) |
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| 22 | Fuel used in nuclear power plants is: A. Uranium – 235 B. Plutonium – 235 c. Plutonium – 238 D. Uranium – 238 |
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| 23 | What is the oxidation state of coloured ion in ( boldsymbol{C r} boldsymbol{O}_{4}^{2-} ) ? |
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| 24 | A reduction in atomic size with increase in atomic number is a characteristics of which elements? A. d-block B. f-block c. radioactive series D. high atomic masses |
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| 25 | Which of the following ion has the maximum theoretical magnetic moment? ( mathbf{A} cdot V^{3} ) в. ( C r^{3} ) ( c cdot T i^{3} ) D. ( C o^{3} ) |
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| 26 | ( mathrm{Cr} mathrm{O}_{2} mathrm{Cl}_{2} ) is formed while testing: A ( cdot N O_{3}^{-} ) B. ( C l^{-} ) ( mathrm{c} cdot mathrm{Cr}^{3} ) D. ( F e^{3} ) |
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| 27 | 1)Write down IUPAC name and symbol of the following atomic number: ( 111,105,102,115 ? ) 2)Why do Zr and Hf have similar radius? |
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| 28 | Elements with high melting point are present in: A . p-block elements B. s-block elements c. d-block elements D. None of these |
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| 29 | Write the uses of actinides. | 12 |
| 30 | The electronic configuration of actinides cannot be assigned with degree of certainty because of : A. overlapping of inner orbitals. B. free movement of electrons over all the orbitals c. small energy difference between 5 f and ( 6 d ) levels. D. none of the above |
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| 31 | The electronic configurations of the first four members of the actinoid series cannot be written accurately in a regular manner because of : A. small difference in energy between ( 5 f ) and ( 6 d ) orbitals B. large difference in energy between ( 5 f ) and ( 6 d ) orbitals C. small difference in energy between ( 5 f ) and 6 s orbitals D. violation of the Pauli exclusion principle |
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| 32 | Choose the incorrect statement among the following: A. the chemistry of different lanthanoids is very similar B. ( 4 f- ) and ( 5 f- ) orbitals are equally shielded C. ( d- ) block element show irregular and erratic chemical properties among themselves D. ( L a ) and ( L u ) have partially filled d-orbitals |
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| 33 | Photochromic glass, used for sunglasses, darkens when exposed to bright light and becomes more transparent again when the light is less bright. The darkness of the glass is related to the concentration of silver atoms. The following reactions are involved. reaction ( 1 A g^{+}+C l^{-} rightleftharpoons A g+C l ) reaction 2 ( boldsymbol{C u}^{+}+boldsymbol{C l} rightarrow boldsymbol{C u}^{2+}+boldsymbol{C l}^{-} ) reaction 3 ( C u^{2+}+A g rightarrow C u^{+}+A g^{+} ) Which statement about these reactions is correct? A ( cdot C u^{+} ) and ( C u^{2+} ) ions act as catalysts B. ( C u^{+} ) ions act as an oxidising agent in reaction 2 c. Reaction 3 increases the darkness of the glass D. silver atoms are reduced in reaction 3 |
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| 34 | Which of the following statements is not true about ( K M n O_{4} ? ) A. Its solution is unstable in acidic medium. B. A green coloured solution containing ( M n O_{3}^{+} ) ions is formed when a small quantity of ( K M n O_{4} ) is added to concentrated ( H_{2} S O_{4} ) C. ( M n O_{4}^{-} ) changes to ( M n^{2+} ) in basic solution D. It acts as a self-indicator in the titration with ( F e^{2+} ) or ( C_{2} O_{4}^{2-} ) |
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| 35 | The highest magnetic moment is shown by the transition metal ion with which of the following outermost electronic configuration? ( A cdot 3 d^{2} ) в. ( 3 d^{5} ) ( c cdot 3 d^{7} ) D. ( 3 d^{9} ) |
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| 36 | What is the correct order of covalent size of the following? ( mathrm{Nb} ) A. ( mathrm{Nb}= ) Ta B. Nb mathrm{T} ) D. None of these. |
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| 37 | Which of the following statement is not correct? ( mathbf{A} cdot L a(O H)_{3} ) is less basic than ( L u(O H)_{3} ) B. In Lanthanoid series ionic radius of ( mathrm{Ln}^{3+} ) ions decreases C. La is actually an element of transition series rather than Lanthanoid series D. Atomic radii of Zr and Hf are same because of Lanthanoid contraction |
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| 38 | The Molecular weight of Mohr’s salt is 392. Its equivalent weight when it is oxidized by ( K M n O_{4} mathrm{KMnO} 4, ) in acidic medium is: A . 392 B. 196 ( c cdot 130.6 ) D. 78.5 |
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| 39 | Q. 7 Which of the following oxidation state is common for all lanthanoids: (a) +2 (b) +3 (c) +4 (d) +5 Lebeneide of which also show 2 and LA |
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| 40 | Snorl Answer Type Question 1. Why does copper metal not replace hydrogen from acid? |
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| 41 | Most of the transition metals exhibit: (i) paramagnetic behaviour (ii) diamagnetic behaviour (iii) variable oxidation states (iv) formation of coloured ions A. (ii), (iii) and (iv) B. (i), (iii) and (iv) c. (i), (ii) and (iii) D. (i), (ii) and (iv) |
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| 42 | Q. 30 Which of the following will not act as oxidising agents? (a) Croz (b) Moog (c) WO3 (d) Cro |
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| 43 | ( K M n O_{4} ) spot can be bleached by: A. ( H_{2} O_{2} / H^{+} ) в. ( S O_{2} / H^{+} ) ( mathrm{c} cdot mathrm{C}_{2} mathrm{O}_{4}^{2-} / mathrm{H}^{+} ) D. all of these |
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| 44 | Question 17. Identi 17. Identify A to B and also explain the reactions involved. CuCoz CuO Heat with Cus (A) | HNO3 (Conc.) (B) NH, (aq) (C) Blue solution (D) Ca(OH)2 (E) Milky co₂ Ca(HCO3)2 Clear solution |
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| 45 | Which of the following statement is not ( c ) Orrect? ( mathbf{A} cdot L a(O H)_{3}, ) is less basic than ( L u(O H)_{3} ) B. In lanthanide series, ionic radius of ( L n^{3}+ ) ions decreases C. ( L a ) is actually an element of transition series rather than lanthanide series D. Atomic radii of ( Z r ) and ( H f ) are same because of lanthanide contraction |
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| 46 | Monazite is an ore of: A. titanium B. throium c. zirconium D. iron |
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| 47 | Which of the following statement is wrong regarding Lanthanoids? A. The ionic size of ( L n(| I) ) ions decreases with increasing atomic number B. ( ln ( ) III ) hydroxides are mainly basic in nature C. ( operatorname{Ln}(text { III }) ) compounds are predominantly ionic in character D. ( operatorname{Ln}(text { III }) ) compounds are generally colourless |
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| 48 | 27 Which of the following lanthanoids show +2 oxidation state besides the characteristic oxidation state +3 of lanthanoids? (b) Eu (c) Yb (d) Ho (a) Ce |
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| 49 | Each of the following ion contains vanadium in +5 oxidation state except: A. ( V O_{2}^{text {th }} ) B. ( V(O H)_{4}^{+} ) c. ( V O^{2+} ) D ( cdotleft[V O_{3} O Hright]^{2} ) |
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| 50 | Amphoteric oxides of Mn and Cr are: ( mathbf{A} cdot M n O ) and ( C r O ) B. ( M n_{2} O_{3} ) and ( C r_{2} O_{3} ) c. ( M n O_{2} ) and ( C r_{2} O_{3} ) D. ( M n_{2} O_{7} ) and ( C r O_{3} ) |
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| 51 | The magnetic moment is associated with its spin angular momentum and orbital angular momentum. Spin only magnetic moment value of ( boldsymbol{C r}^{3+} ) ion is : ( mathbf{A} cdot 2.87 mathrm{B} . mathrm{M} ) B. 3.87 В.М. c. 3.47 В.M. D. 3.57 В.М. |
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| 52 | Arrange the oxides of manganese according to increasing acidic strength. ( mathbf{A} cdot M n O<M n_{3} O_{4}<M n_{2} O_{3}<M n O_{2}<M n_{2} O_{7} ) B. ( M n_{2} O_{7}<M n O_{2}<M n_{2} O_{3}<M n_{3} O_{4} ) ( mathbf{c} cdot M n O_{2}<M n_{2} O_{7}<M n_{3} O_{4}<M n_{2} O_{3}<M n O ) D. ( M n_{3} O_{4}<M n_{2} O_{3}<M n_{2} O_{7}<M n O_{2}<M n O ) |
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| 53 | The colourless species is A. ( V C l_{3} ) в. ( operatorname{VOSO}_{4} ) c. ( N a_{3} V O_{4} ) ( mathrm{D} cdotleft[Vleft(mathrm{H}_{2} mathrm{O}right)_{6}right] mathrm{SO}_{4} cdot mathrm{H}_{2} mathrm{O} ) |
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| 54 | Account for the following: ( T i^{3+} ) is coloured whereas ( S c^{3+} ) is colourless in aqueous solution. |
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| 55 | What is Lanthanoid contraction? Mention one of its consequences. |
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| 56 | Which of the following lanthanoid ions is diamagnetic? ( mathbf{A} cdot S m^{2}+ ) B. ( C e^{2} ) ( mathrm{c} cdot Y b^{2} ) D. ( E u^{2} ) |
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| 57 | ale en oily a When KMnO4 solution is added to oxalic acid solution, the decolounsation is slow in the beginning but becomes instantaneous after some time because (a) CO, is formed as the product (b) reaction is exothermic (c) MnO2 catalyses the reaction (d) Mn2+ acts as autocatalyst fy the whon Man colitice |
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| 58 | 0.2 The electronic configuration of Cu(II) is 3d where as that of Cu(I) is 3d”. Which of the following is correct? (a) Cu(II) is more stable (b) Cu(II) is less stable (c) Cu(I) and Cu(II) are equally stable (d) Stability of Cu(I) and Cu(II) depends on nature of copper salts |
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| 59 | The only radioactive element among the lanthanoids is A. Gadolinium B. Holmium c. Promethium D. Neodymium |
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| 60 | The elements having the general configuration, ( 4 f^{1-14} 5 s^{2} 5 p^{6} d^{0-1} 6 s^{2} ) are referred as A. alkali metals B. transition elements c. lanthanoids D. actinides |
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| 61 | Knowing that the Chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of the following statements is incorrect? A. Because of the large size of the ( operatorname{Ln}( ) (II) ions the bonding in its compounds is predominantly ionic in character. B. The ionic sizes of Ln (III) decrease in general with increasing atomic number c. ( mathrm{Ln} ) (III) compounds are generally colourless D. Ln (III) hydroxides are mainly basic in character |
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| 62 | What happens when ( S O_{2} ) is passed through acidified ( K_{2} C r_{2} O_{7} ) solution? |
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| 63 | To protect iron against corrosion, the most durable metal plating on it, is : A. nickel plating B. tin plating C. copper plating D. zinc plating |
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| 64 | What would be magnetic moment of ( boldsymbol{G} boldsymbol{d}^{+3}(boldsymbol{Z}=mathbf{6 4}) ? ) A. 7.9 BM B. 3.62 ВМ c. ( 10.60 mathrm{BM} ) D. 9.72 ВМ |
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| 65 | What is the effect on density if we increase atomic number in lanthanides? A. Increase B. Very low c. Decrease D. Very high |
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| 66 | Which of the following is a Lanthanoid? A. Ta B. Rh ( c . ) Th D. Lu |
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| 67 | ( boldsymbol{F e}_{3} boldsymbol{O}_{4} ) is called : A. haematite B. magnetite c. cassiterite D. dolomite |
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| 68 | In context of the lanthanoids, which of the following statements is not correct? A. There is a gradual decrease in the radii of the members with increasing atomic number in the series B. All the members exhibit + 3 oxidation state c. Because of similar properties the separation of lanthanoids is not easy D. Availability of 4f electrons results in the formation of compounds in +4 state for all the members of the series |
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| 69 | In the ( 3 d ) series from ( operatorname{Sc}(z=21) ) to Zn ( (z=30), ) enthalpy of atomisation of Zn is the lowest. |
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| 70 | [A] Q. 67 On the basis of lanthanoid contraction, explai sis of lanthanoid contraction, explain the following: (1) Nature of bonding in La,O, and Lu 03. (17) Trends in the stability of oxo salts of lanthanoids from La to Lu. (iii) Stability of the complexes of lanthanoids. (iv) Radii of 4d and 5d block elements. () Trends in acidic character of lanthanoid oxides. |
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| 71 | Oil is converted into fat by using as a catalyst. A . Ni B. Fe ( c . ) мп D. ( V_{2} O_{5} ) |
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| 72 | Name the transition element of highest density | 12 |
| 73 | The general electronic configuration ( (n-1) d^{8} n s^{2} ) indicates that the particular element belongs to A. VIII group B. V B group c. IV B group D. II B group |
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| 74 | The element that has two unpaired electrons in its ( M^{2+} ) ion form is: A. Mn B. cu ( c cdot z n ) D. Ti |
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| 75 | Similarity between ( N b ) and ( T a ) is because they: A. are transition metals B. belong to same group of periodic table c. have the same mineral source D. have almost same ionic and covalent radii |
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| 76 | Identify the incorrect statement among the following. A. ( 4 f ) and ( 5 f ) orbitals are equally shielded. B. 4 -Block elements show irregular and erratic chemical properties among themselves. C. La and Lu have partially filled d-orbitals and no other partially filled orbitals. D. The chemistry of various lanthanoids is very similar. |
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| 77 | Heaviest atom among the following is: A. uranium B. Ieadd c. mercury D. radium |
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| 78 | Spin only magnetic moment of the compound ( boldsymbol{H} boldsymbol{g}left[boldsymbol{C o}(boldsymbol{S} boldsymbol{C} boldsymbol{N})_{4}right] ) is : A ( cdot sqrt{3} ) B. ( sqrt{15} ) c. ( sqrt{24} ) D. ( sqrt{8} ) |
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| 79 | Which of the following statements is/are correct for the Lanthanoids? A. The 4f electrons do not take part in bonding B. The 4f electrons can neither be removed to produce ions nor be made to take part in crystal field stabilization of complexes c. The 4 felectrons in the antepenultimate shell are very effectively shielded by the 5 s and 5 p electrons D. All of the above |
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| 80 | Percentage of Cu is minimum in : A. brass B. bronze c. duralumin D. gun mental |
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| 81 | In which of the following compounds transition metal has zero oxidation state? A. ( mathrm{CrO}_{5} ) B. ( mathrm{NH}_{2} cdot mathrm{NH}_{2} ) c. ( mathrm{NOClO}_{4} ) D ( cdotleft[F e(C O)_{5}right] ) |
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| 82 | Statement 1: Transition metal compounds generally exhibit bright colors. Statement 2: The electrons in the partially filled d orbitals are easily promoted to excited states. 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 Statement1 and Statement 2 are not correct |
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| 83 | 2 54 Match the properties given in Column I with the metals given in Column II. Column 1 Column II (Property) (Metal) A. An element which can show +8 oxidation state Mn B. 3d block element that can show upto +7 oxidation state C. 3d block element with highest melting point |
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| 84 | Chromium – plated steel is a material of popular use. During its process of manufacture, the effluent contains chromate and cyanide ions as impurities. After these are chemically removed, carbon dioxide and salt (sodium chloride) still remain as impurities. This salt solution is purified electrolytically by adding carbonaceous matter which acts as: A. a microcell B. an electrode c. a cathode D. a salt absorber |
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| 85 | The size of ( N b ) is very similar to: A. ( L a ) в. ( H f ) c. ( T a ) D. ( W ) |
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| 86 | Assertion In any transition series, the magnetic moment of ( M^{2+} ) ion first increases and then decreases. Reason In any transition series, the number of unpaired electrons first increases, afterwards decrease 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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| 87 | Which element can show ( +2,+3,+4+6 ) and +7 oxidation states? A . cr в. мп ( c cdot c_{0} ) D. |
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| 88 | The electronic configuration of the first artificial element: A ( cdot 4 f^{4} 5 d^{1} 6 s^{2} ) B . ( 4 f^{1} 5 d^{4} 6 s^{2} ) c. ( 5 f^{4} 6 d^{1} 7 s^{2} ) D. ( 5 f^{3} 6 d^{1} 7 s^{2} ) |
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| 89 | (a) What is Lanthanoid contraction? (b) What are Interstitial compounds? Give an example. (c) Calculate the ‘Spin only’ magnetic moment of ( M_{(a q)}^{2+} ) ion ( (Z=29) ) |
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| 90 | Lanthanides and actinides are recognised as: A. ( s ) – block elements B. ( d ) -block elements c. ( f ) -block elements D. ( p ) -block elements |
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| 91 | In acidic medium, ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) changes ( C r_{2} O_{7}^{-2} ) to ( C r O_{5} ) which has two ( (-O- ) ( O-) ) bonds oxidation state of ( C r ) in ( boldsymbol{C r} boldsymbol{O}_{5} ) is: ( A cdot+5 ) ( B cdot+3 ) ( c cdot+6 ) D. -10 |
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| 92 | Which of the following lanthanoid ions is diamagnetic? (Atoms, ( C e= ) ( mathbf{5 8}, boldsymbol{S m}=mathbf{6 2}, boldsymbol{E u}=mathbf{6 3}, boldsymbol{Y b}=mathbf{7 0} mathbf{)} ) A ( cdot Y b^{2} ) в. ( C e^{2} ) ( mathrm{c} cdot mathrm{Sm}^{2+} ) D. ( E u^{2} ) |
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| 93 | Which metal can not be extracted by smelting process: ( A cdot P b ) B. Fe ( c cdot z n ) ( D cdot A ) |
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| 94 | Which of the following arrangements does not represent the correct order of the property stated against it? This question has multiple correct options A ( cdot N i^{2+}<C o^{2+}<F e^{2+}<M n^{2+}: ) lonic size B . ( C o^{3+}<F e^{3+}<C r^{3+}<S c^{3+}: ) Stability in aqueous solution c. ( S c<T i<C r<M n ) : Number of oxidation states D. ( V^{2+}<C r^{2+}<M n^{2+}<F e^{2+}: ) Paramagnetic behaviour |
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| 95 | Which of the following statement is incorrect for ( K M n O_{4} ? ) A. It is used as antiseptic B. It is an oxidising agent C. It is used as bleaching agent in textile industries D. It Is steak mole allotted amorphous substance |
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| 96 | Which of the following weights less when weighted in magnetic field? A. ( S r C l_{3} ) в. ( F e C l_{3} ) c. ( T i C l_{3} ) D. ( V C l_{3} ) |
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| 97 | Eu SAD ation reactions? Q.8 Which of the following reactions are disproportionation read (1) Cu- Cu2+ + Cu (ii) 3MnO2 + 4H 2 Mn0Z + MnO2 + 2H20 (iii) 2KMnO,- KMnO4 + MnO2 + 02 (iv) 2MnO2 + 3Mn2+ + 2H20 5 MnO2 + 4H* (a) (1) (b) (i), (ii) and (iii) (c) (ii), (iii) and (iv) (d) (i) and (i |
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| 98 | Represent the structure of dichromate ion. |
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| 99 | In dilute alkaline solution ( M n O_{4}^{-} ) changes to: A ( cdot M n O_{4}^{2} ) в. ( M n O_{2} ) c. ( M n_{2} O_{3} ) D. ( M n O ) |
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| 100 | Which of the following ion is more paramagnetic? A ( cdot L a^{3+}(Z=57) ) B . ( L u^{3+}(Z=71) ) ( mathbf{c} cdot Y b^{3+}(Z=70) ) D. ( S m^{3+}(Z=62) ) |
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| 101 | The compound of vanadium has magnetic moment of ( 1.73 B ). The vanadium chloride has the formula: A ( cdot V C l_{2} ) в. ( V C l_{3} ) c. ( V C l_{4} ) D. ( V C l_{5} ) |
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| 102 | edium acidic in oxidation reactions of 0.21 Why is HCL not used to make the medium acidic in oxidati KMnO, in acidic medium? (a) Both HCl and KMnO, act as oxidising agents (b) KMnO, oxidises HClinto Cl, which is also an oxidising agent (c) KMnO4 is a weaker oxidising agent than HCI (d) KMnO4 acts as a reducing agent in the presence of HCI ution monotions of KMnO, in acidic le |
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| 103 | Most copper ( (I) ) compounds are found to be colourless. This is due to A. presence of low oxidation state of copper B. completely filled d-level in ( C u(I) ) c. diamagnetic nature of the compound D. high polarizability of ( C u(I) ) ion |
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| 104 | Show with balanced equations what happens when the following are mixed: potassium permanganate interacts with manganese dioxide in the presence of potassium hydroxide. ( mathbf{A} cdot 2 K M n O_{4}+4 K O H+M n O_{2} rightarrow 3 K_{2} M n O_{4}+2 H_{2} O ) B. ( 3 K M n O_{4}+4 K O H+M n O_{2} rightarrow 4 K_{2} M n O_{4}+2 H_{2} O ) c. ( 3 K M n O_{4}+3 K O H+M n O_{2} rightarrow 3 K_{2} M n O_{4}+2 H_{2} O ) D. None of these |
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| 105 | Write the general electronic configuration of lanthanoids. What are transuranic elements? |
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| 106 | Which complex is more stable between ( left[boldsymbol{F e}(boldsymbol{C N})_{6}right]^{4-} ) and ( left[boldsymbol{F e}(boldsymbol{C N})_{6}right]^{3-} ? ) |
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| 107 | Select correct statement(s). This question has multiple correct options A. Stabilities of variable oxidation states can be explained by standard electrode potential B. ( C r^{2+} ) is unstable and ( C r^{3+} ) is stable in aqueous solution C ( cdot F e^{2+} ) is stable and ( F e^{3+} ) is unstable is aerated water D. All of the above |
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| 108 | ( ” F e^{3+} ) is more stable than ( F e^{2+} ) Answer whether the above statement is true or false. If true enter 1 , else enter 0 . |
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| 109 | Among the following outer electronic configurations of atoms, the highest oxidation state is achieved by which one of them? A ( cdot(n-1) d^{8} n s^{2} ) B . ( (n-1) d^{8} n s^{1} ) c. ( (n-1) d^{5} n s^{text {। }} ) D. ( (n-1) d^{5} n s^{2} ) |
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| 110 | The highest possible oxidation states of uranium and plutonium, respectively, are: A .6 and 4 B. 7 and 6 c. 4 and 6 D. 6 and 7 |
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| 111 | Q. 63 Assertion (A) The highest oxidation state of osmium is +8. Reason (R) Osmium is a 5d-block element. be correct y |
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| 112 | When hydrogen peroxide is treated with a cold acidified ( boldsymbol{K}_{mathbf{2}} boldsymbol{C r}_{mathbf{2}} boldsymbol{O}_{mathbf{7}} ) solution containing ether, blue colour is obtained. This is due to: A. perchromic acid B. potassium chromate c. chromium sulphate D. chromium trioxide |
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| 113 | Identify a ‘Chemical twin’ among the followings. ( mathbf{A} cdot Z r-T a ) B. ( N b-T c ) c. ( H f-R e ) D. ( N b-T a ) |
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| 114 | Which of the following properties of Zr and Hf can be explained due to lanthanide contraction? A. Radius of Zr and Hf is same B. Their EN is same C. Their position in periodic table D. All |
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| 115 | Beryllium resembles Aluminium in properties. This is mainly due to: A . equal electro negativity values of elements B. equal atomic volumes of the elements c. equal electron affinity D. equal nuclear charges in their atoms |
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| 116 | Observe the following statements. 1. Lanthanides actively participate in chemical reactions. 2. The basic nature of hydroxides of lanthanides increases from ( L a(O H)_{3} ) to ( L u(O H)_{3} ) 3. Lanthanides do not form coordinate compounds as readily as d-block metals. The correct statements are: A. ( 1,2 & 3 ) В. 183 ( c cdot 1 & 2 ) D. 2 & 3 |
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| 117 | The catalytic activity of transition metals and their compounds is ascribed mainly to: A. their unfilled d-orbitals B. their ability of adopt variable oxidation states c. their chemical reactivity D. their magnetic behaviour |
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| 118 | Question 26. Indicate the steps in the preparation of: (i) K2Cr2O from chromite (ii) KMnO4 from pyrolusite ore (MnO2) |
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| 119 | The Lanthanoid contraction refers to: A. valence electrons of the Lanthanide series B. ionic radius of the series C . the density of the series D. nuclear mass of the series |
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| 120 | Select correct order of sizes of different species. ( mathbf{A} cdot Z r=H f ; N b=T a ; F e=C o=N i ) B ( cdot Z r^{4+}<Z r ; N b^{3+}<T a^{3+}, F e^{3+}<F e^{2+}<F e ) ( mathbf{c} cdot Z r^{4+}=H f^{4+} ; N b^{3+}=T a^{3+} ; F e<C o<N i ) D. ( Z r^{4+}<H f^{4+} N b^{3+}=T a^{3+}, N i<C u<C o ) |
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| 121 | In the dichromate dianion, the nature of bonds are: A. four equivalent ( C r-O ) bonds B. six equivalent ( C r-O ) bonds and one ( O-O ) bond C . six equivalent ( C r-O ) bonds and one ( C r-C r ) bond D. six non-equivalent ( C r-O ) bonds E. six equivalent ( C r-O ) bonds and one ( C r-O-C r ) bond |
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| 122 | The lanthanides contraction refers to: A. ionic radius of the series B. valence electrons of the series c. the density of the series D. electronegativity |
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| 123 | Assertion To a solution of potassium chromate, if a strong acid is added, it changes its color from yellow to orange. Reason The color change is due to the change in oxidation state of potassium chromate. 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 are correct. |
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| 124 | Which one is classified as a condensation polymer? A. Dacron B. Neoprene c. Teflon D. None of these |
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| 125 | The aqueous solution of the salt will colored in the case of: This question has multiple correct options ( mathbf{A} cdot Z nleft(N O_{3}right)_{2} ) в. ( operatorname{LiNO}_{3} ) ( mathrm{c} cdot mathrm{Co}left(mathrm{NO}_{3}right)_{2} ) D. ( C r C l_{3} ) |
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| 126 | Assertion The number of unpaired electrons in the following gaseous ions: ( M n^{3+}, C r^{3+}, V^{3+} ) and ( T i^{3+} ) are 4,3,2 and 1 respectively. Reason Among these ( mathrm{Cr}^{3+} ) is most stable in aqueous solution. 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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| 127 | Assertion La’should be the ( f ) -block element according to Aufbau principle. Reason 57 th electron exceptionally enters into the ( 5 d ) -orbital. Read the above assertion and reason |
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| 128 | Identify ( boldsymbol{A}, boldsymbol{B}, boldsymbol{C}, boldsymbol{D}, boldsymbol{E}, boldsymbol{F}, boldsymbol{G} ) ( mathbf{K}_{2} mathbf{C r}_{2} mathbf{O}_{7} stackrel{mathbf{K O H}}{longrightarrow}(mathbf{A}) frac{mathbf{P} mathbf{b}left(mathbf{C H}_{3} mathbf{C O O}right)_{2}}{mathbf{C H}_{3} mathbf{C O O H}}>(mathbf{B}) ) ( mathbf{N H}_{4} mathbf{C l} ) ( (mathrm{C}) stackrel{Delta}{longrightarrow}(mathrm{D})+(mathrm{E}) ) (gas) (green) ( frac{|mathbf{A}|, Delta}{mid} ) (F) (metal) ( +(G) ) oxide |
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| 129 | Explain actinoid contraction. | 12 |
| 130 | Knowing that the chemistry of lanthanoids ( (L n) ) is dominated by its +3 oxidation state, which of the following statements is incorrect? A. The ionic size of ( L n(I I I) ) decrease in general with increasing atomic number B. ( L n(I I I) ) compounds are generally colourless c. ( L n(I I I) ) hydroxide are mainly basic in character D. Because of the large size of the ( L n(I I I) ) ions the bonding in its compound is predominantly ionic in character |
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| 131 | Explain : When ( M n(O H)_{2} ) is made by adding an alkali to a solution containing ( M n^{2+} ) ions, the ppt quickly darkens, and eventually goes black A. The black colour is due to the manganese (VI) oxide ( M n_{2} O_{3} ) B. The black colour is due to the manganese (VI) oxide ( M n O_{2} ) C. The black colour is due to the manganese (VI) oxide ( M n_{2} O_{5} ) D. None of these |
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| 132 | State the number of unpaired electrons in ( N i^{2+}: ) ( A cdot O ) B. 2 ( c cdot 4 ) D. 8 |
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| 133 | Which of the following group contains coloured ions? 1. ( boldsymbol{C} boldsymbol{u}^{+} ) 2. ( boldsymbol{T} boldsymbol{i}^{4+} ) 3. ( C o^{2+} ) 4. ( boldsymbol{F} boldsymbol{e}^{2+} ) A .1,4 в. 3,4 c. 2,3 D. 1,2 |
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| 134 | Ammonia will not form complex with: A ( cdot A g^{2} ) B. ( P b^{2} ) ( c cdot C u^{2} ) D. ( C d^{2} ) |
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| 135 | Acidified ( K_{2} C r_{2} O_{7} ) solution turns green when ( N a_{2} S O_{3} ) is added to it. This is due to the formation of: A ( cdot C r O_{4}^{2-} ) В ( cdot C r_{2}left(S O_{3}right)_{3} ) ( mathrm{c} cdot mathrm{CrSO}_{4} ) D ( cdot C r_{2}left(S O_{4}right)_{3} ) |
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| 136 | Cerium ( (Z=58) ) is an important member of lanthanides. Which of the following statements about cerium is correct? A. The common oxidation states of cerium are +3 and +4 B. The +3 oxidation states of cerium is more stable than the +4 state c. The +4 oxidation states of cerium is not known in solutions D. Cerium (IV) acts as an oxidising agent. |
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| 137 | The common oxidation state shown by Europium in their compounds is: ( A cdot+1 ) ( B cdot+3 ) ( c cdot+5 ) ( D cdot+6 ) |
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| 138 | Fourteen elements following Lanthanum are called Lanthanoids: (a) What is Lanthanoid contraction? Give reason for it. (b) ( K M n O_{4} ) is a purple coloured crystal and it acts as an oxidant. How will you prepare ( boldsymbol{K} boldsymbol{M} boldsymbol{n} boldsymbol{O}_{4} ) from ( boldsymbol{M} boldsymbol{n} boldsymbol{O}_{2} ? ) |
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| 139 | 5f series elements are known as A. Lanthanides B. Representative elements c. Transition elements D. Actinides |
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| 140 | Which of the following is not the configuration of Lanthanoid? ( mathbf{A} cdot[X e] 4 f^{10} 6 s^{2} ) B ( cdot[X e] 4 f^{1} 5 d^{1} 6 s^{2} ) ( mathbf{c} cdot[X e] 4 f^{14} 5 d^{10} 6 s^{2} ) ( mathbf{D} cdot[X e] 4 f^{7} 5 d^{1} 6 s^{2} ) |
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| 141 | Which of the following oxidation state is not shown by Manganese? ( A cdot+1 ) B. +2 ( c cdot+4 ) D. +7 |
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| 142 | ( L n^{3+}( ) trivalent lanthanides ions) have ( E C ) A ( cdot[X e] 4 f^{1} ) to ( [X e] 4 F^{14} ) B . ( [X e] 4 d^{1} 4 f^{1} ) to ( [X e] 4 d^{1} 4 F^{14} ) ( mathbf{c} cdot[X e] 4 d^{2} 4 f^{0} ) to ( [X e] 4 d^{1} 4 F^{1} ) D ( cdot[X e] 4 f^{0} ) to ( [X e] 4 F^{1} ) |
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| 143 | The element with the electronic configuration ( [boldsymbol{X} boldsymbol{e}] boldsymbol{4} boldsymbol{f}^{14} boldsymbol{5} boldsymbol{d}^{1} boldsymbol{6} boldsymbol{s}^{2} ) is a A. representative element B. transition element c. actinide element D. Lanthanides element |
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| 144 | Q. 44 Explain why does colour of KMnO, disappear when oxalic acid is added to its solution in acidic medium? |
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| 145 | Explain briefly the cause of Lanthanoid contraction |
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| 146 | Which of the following Lanthanoid is radioactive? A. Cerium B. Promethium c. Thulium D. Lutetium |
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| 147 | Question 22. Mention the type of compounds formed when small atom like H, C and N get trapped inside the crystal lattice of transition metak Also give physical and chemical characteristics of these compounds. |
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| 148 | When ( M n O_{2} ) is fused with ( K O H, ) a coloured compound is formed. The product and its colour is: A ( cdot K_{2} M n O_{4}, ) green B. ( K M n O_{4} ), purple c. ( M n_{2} O_{3} ), brown D. ( M n_{3} O_{4} ), black |
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| 149 | Maximum oxidation state exhibited by lanthanides is: ( A cdot+1 ) B. +2 ( c cdot+3 ) D. +4 |
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| 150 | Which of the following metals are present in Devarda alloy?
This question has multiple correct options |
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| 151 | The colour of Lanthanoids and Actinoids is due to: A. s-ftransitions B. p-f transitions c. d-f transitions D. f-f transitions |
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| 152 | (i) With reference to structural variability and chemical reactivity, write the difference between lanthanoids and actinoids. (ii) Name a member of the lanthanoid series which is well known to exhibit +4 oxidation state (iii) Complete the following equation: [ M n O_{4}^{-}+8 H^{+}+5 e^{-} rightarrow ] (iv) Out of ( M n^{3+} ) and ( C r^{3+}, ) which is more paramagnetic and why? (atomic number : ( M n=25, C r=24) ) |
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| 153 | Lanthanoids are: A. 14 elements in the seventh period left ( atomic no. ( =90 ) to ( 103 text { right }) ) that are filling ( 5 f ) sublevel B. 14 elements in the sixth period left ( atomic no. 58 to 71 right ) that are filling ( 4 f ) sublevel C. 14 elements in the seventh period left ( atomic no. ( =58 ) to ( 71 text { right }) ) that are filling ( 4 f ) sublevel D. 14 elements in the sixth period left ( atomic no. 90 to ( 103 text { right }) ) that are filling ( 4 f ) sublevel |
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| 154 | Lanthanoids are characterized by the filling of the: A. penulimate 4f energy level B. antepenultimate 4f energy level c. penultimate 3f energy level D. antepenultimate 3f energy level |
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| 155 | The electronic configuration of actinides cannot be predicted with degree of certainty because of : A. small energy difference between 5f and 6d levels B. overlapping of inner orbitals C. free movement of electrons over all the orbitals D. none of the above |
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| 156 | Larger number of oxidation states are exhibited by the actinides than those by lanthanoids, the main reason being A. more energy difference between 5 f and 6d than between 4 f and 5 d orbital B. more reactive nature of the actinoids than the lanthanoids c. ( 4 f ) orbitals more diffused than the 5 orbital D. lesser energy difference between 5 fand 6 than between ( 4 mathrm{f} ) and ( 5 mathrm{d} ) orbital |
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| 157 | 20. Cro, is the oxidation product of Cro, using H,O.. H many (0 – Cr – O) bonds are there in it? |
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| 158 | When ( K M n O_{4} ) reacts with ( H_{2} O_{2} ) in acidic medium then which of the following is formed? ( mathbf{A} cdot M n^{+2} ) B. ( M n^{+7} ) c. ( M n O_{2} ) D. ( M n_{2} O_{3} ) |
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| 159 | Magnetic moment of ( left[boldsymbol{C u}left(boldsymbol{N} boldsymbol{H}_{3}right)_{4}right]^{2+} ) ion is? A ( cdot 1.414 ) B. 1.73 c. 2.23 D. 2.38 |
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| 160 | The colourless species is (are): A . VCl B. voso ( _{4} ) ( c cdot ) Nas vo ( _{4} ) ( D cdotleft[Vleft(H_{2}right)_{6}right] S O_{4} cdot H_{2} O ) |
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| 161 | Which group elements exhibits highest densities? A. IIIB в. Iv c. vı D. VIIIB |
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| 162 | The Lanthanide contraction relates to: A. oxidation states B. magnetic state c. atomic radius D. valence electrons |
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| 163 | 0. 20 Altho 20 Although zirconium belongs to 4d transition series and hatniun to 5d transition series even then they show similar physical and cheme properties because …….. (a) both belong to d-block (b) both have same number of electrons (c) both have similar atomic radius (d) both belong to the same group of the Periodic Table e ndienio vodi |
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| 164 | We use ( Z n O ) in paints instead of ( P b^{2+} ) salts. If true enter 1 , else enter 0 . |
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| 165 | Iron is in +2 oxidation state in: This question has multiple correct options ( mathbf{A} cdot N a_{2}left[F e(C N)_{5} N Oright] ) ( mathbf{B} cdotleft[F eleft(H_{2} Oright)_{5} N Oright] S O_{4} ) ( mathbf{c} cdot K_{3}left[F e(C N)_{6}right] ) ( mathbf{D} cdot K_{4}left[F e(C N)_{6}right] ) |
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| 166 | What is the atomic number of the element with ( M^{2+} ) ion having electronic configuration ( [boldsymbol{A} boldsymbol{r}] boldsymbol{3} boldsymbol{d}^{8} ? ) A . 25 B . 28 c. 27 D. 26 |
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| 167 | 15 The magnetic moment is associated with its spin angular momentum and orbital angular momentum. Spin only magnetic moment value of Cror ion (a) 2.87 BM (c) 3.47 BM (b) 3.87 BM (d) 3.57 BM |
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| 168 | Which of the following arrangments does not represent the correct order of the property stated against it? (1) ( V^{2+}<C r^{2+}<M n^{2}<F e^{2+} ) paramagnetic behaviour (2) ( N i^{2+}<C o^{2+}<F e^{2+}<M n^{2+} ) ionic size (3) ( C o^{3+}<F e^{3+}<C r^{3+}<S c^{3+} ) stability in aqueous solution (4) ( S c<T i<C r<M n: ) number of oxidation states |
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| 169 | Following elements do not show the properties characteristic of d-block elements: A. ( C u, A g, A u ) в. ( Z n, H g, C d ) c. ( S c, T i, V ) D. Fe, Co, Ni |
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| 170 | Due to the loss of the following electrons, transition metal shows variable valency: ( A cdot n s ) B. ns and np ( c cdot(n-1) d ) D. (n-1)d and ns |
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| 171 | It is sometimes necessary to remove colouring matter contained as an impurity in glass. Glass is decolourised by: A. wood charcoal B. manganese dioxide c. bleaching powder D. hydrogen |
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| 172 | Transuranic elements begin with: ( A cdot N p ) в. ( mathrm{cm} ) c. Pu D. |
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| 173 | Write balanced chemical equations for the reduction reaction of lead (II) oxide by carbon. |
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| 174 | ( C u S O_{4} cdot 5 H_{2} O ) is blue in colour whereas anhydrous ( C u S O_{4} ) is colourless.Why? |
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| 175 | f the following ion is coloured enter 1 else enter 0 ( M n^{2+} ) |
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| 176 | Question 8. What are the characteristics of the transition elements and why are they called transition elements? Which of the d-block elements may not be regarded as the transition elements? Transition elements are placed between s and p block elements in the Period Table and have incompletely filled d-orbital in neutral state or in any of the oxidation states. |
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| 177 | Question 20. Compare the chemistry of actinoids with that of the lanthanoids with special reference to (i) electronic configuration (ii) atomic and ionic sizes (iii) oxidation state (iv) chemical reactivity |
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| 178 | The composition of mischmetal is: A. ( 5 % ) of a lanthanoid metal, ( 95 % ) of iron and traces of ( S, C, C a ) and ( A l ) B. ( 95 % ) of an actinoid metal, ( 5 % ) of iron and traces of ( S, C, C a ) and ( A l ) C. ( 95 % ) of a lanthanoid metal, ( 5 % ) of iron and traces of ( S, C, C a ) and ( A l ) D. ( 95 % ) of a transition metal, ( 5 % ) of iron and traces of ( S, C, C a ) and ( A l ) |
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| 179 | Oxidation state of Mg in chlorophyll is: ( A cdot+2 ) B. +6 ( c cdot+3 ) ( D cdot+4 ) |
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| 180 | Differentiate Lanthanides and Actinides. |
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| 181 | Which element among the Lanthanides has the smallest atomic radius? A. Cerium B. Lutetium c. Europium D. Gadolinium. |
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| 182 | Among ‘3d’ series of elements, the one that cannot liberate hydrogen with dil acids is: A. cu B. Sç ( c cdot z n ) D. Mn |
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| 183 | Lanthanoid contraction is applicable on which group of the following element set? This question has multiple correct options A ( . Z n, ) Cd, ( H g ) в. ( T i, Z r, H f ) c. ( S c, Y, L a ) D. ( C u, A g, Z n ) E. ( V, N b, T a ) |
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| 184 | Question 15. While filling up of electrons in the atomic orbitals, the 4s-orbital is filled before the 3d-orbital but reverse happens during the ionisation of the atom. Explain why? |
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| 185 | Question 16. Describe the preparation of potassium permanganate. How does the acidified permanagate solution react with (i) iron (II) ions (ii) SO, and (iii) oxalic acid Write the ionic equations for the reactions. In acidic medium KMnO4 is a good oxidising agent. It oxidises (1) Fe2+ into Fe3+ (11) SO, into so (iii) (COOH), into Co, and itself gets reduced to Mn2+ ion. |
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| 186 | Write general configuration of inner transition element. what is the important of the element? |
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| 187 | In which case there is change in oxidation number: A . Aqueous solution of ( C r O_{4}^{2-text { – – is acidified }} ) B. ( S O_{2} ) gas is passed into ( C r_{2} O_{7}^{2} ) c. ( C r_{2} O_{7}^{2-} ) solution is made alkaline D. ( C r O_{2} C l_{2} ) is dissolved in ( N N a O H ) |
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| 188 | In which state, the lanthanide ions are coloured? This question has multiple correct options A. Solid B. Gas c. Aqueous D. Not coloured |
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| 189 | Which of the following ions is coloured in aqueous solution? ¡) ( C u^{2+} ) ii) ( boldsymbol{C} boldsymbol{u}^{mathbf{1}+} ) |
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| 190 | A compound of vanadium possesses a magnetic moment of 1.73 BM. The oxidation state of vanadium in this compounds is : A B. 2 ( c cdot 4 ) D. can not be predicted |
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| 191 | The main reason for larger number of oxidation states exhibited by the actinoids than the corresponding lanthanoids, is: A. the lesser energy difference between ( 5 f ) and ( 6 d ) orbitals than between ( 4 f ) and ( 5 d ) orbitals B. more energy difference between 5 fand 6 d orbitals than between ( 4 f ) and ( 5 d ) orbitals C . greater reactive nature of the actinoids than the lanthanoids D. larger atomic size of actinoids than the lanthanoids |
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| 192 | Question 10. What are the different oxidation states exhibited by lanthanoids? |
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| 193 | Most common oxidation states shown by cerium are: ( mathbf{A} cdot+2,+4 ) B. +3,+4 ( mathrm{c} cdot+3,+5 ) D. +2,+3 |
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| 194 | The actinoids which shows +7 oxidation state are: A. U, NP B. Pu, Am c. Np, Pu D. ( A m, C m ) |
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| 195 | Mohr salt, ( boldsymbol{F} boldsymbol{e} boldsymbol{S} boldsymbol{O}_{4} cdotleft(boldsymbol{N} boldsymbol{H}_{4}right)_{2} cdot boldsymbol{S} boldsymbol{O}_{4} ) ( 6 H_{2} O, ) is preferred over ( F e S O_{4} cdot 7 H_{2} O ) for standardization of ( K M n O_{4} ) solution because: A. Mohr’s salt is a double salt wile ferrous sulphate B. Mohr’s salt is not hygroscopic but ( F e S O_{4} cdot 7 mathrm{H}_{2} mathrm{O} ) is hygroscopic. c. Moh’sr salt contains only ferrous ions whereas ferrous sulphate contains some ferric ions D. Mohr’s salt solution can be titrated even in the absence of ( H_{2} S O_{4} ) |
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| 196 | Which of the following ions having following electronic structure would have maximum magnetic moment? A ( cdot 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{3} ) B . ( 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{5} ) ( mathbf{c} cdot 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{7} ) D cdot ( 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{9} ) |
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| 197 | Question 10. Actinoid contraction is greater from element to element than lanthanoid contraction? () General electronic configuration of lanthanoids and actinoids are 41-14500-6s2 and 5f-14600-17s respectively. (ii) Shielding effect of 4f-electrons is more than that of 5f-electrons. |
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| 198 | Which of the following element exhibits maximum oxidation state? A. Mn B. co c. ( mathrm{Fe} ) D. zn |
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| 199 | The starting and ending elements of actinides are respectively: ( mathbf{A} cdot T h ) and ( L u ) B. ( T h ) and ( L r ) c. ( A c ) and ( L u ) D. ( A c ) and ( L r ) |
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| 200 | Among the following, the species that is both paramagnetic and coloured is : B. ( left[T i C l_{6}right]^{2-} ) ( mathbf{c} cdotleft[V O_{4}right]^{3} ) D. ( operatorname{Cr} mathrm{O}_{2} mathrm{Cl}_{2} ) |
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| 201 | An aqueous solution containing ( boldsymbol{V}^{boldsymbol{x}} ) ion has magnetic moment equal to ( sqrt{15} B M . ) Therefore, the ( x ) is: ( A cdot 5 ) B. 2 ( c .3 ) D. 4 |
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| 202 | Which of the following metals is used in ceramic applications? This question has multiple correct options A. Cerium B. Neodymium c. Praseodymium D. None of these |
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| 203 | The equilibrium established when ( H g C l_{2} ) is shaken with an excess of ( H g ) is: ( mathbf{A} cdot H g^{2+}+H g rightleftharpoons 2 H g^{+} ) B. ( H g^{2+}+H g_{(l)} rightleftharpoons H g_{2}^{2+} ) C. ( H g+2 H g^{2+} rightleftharpoons H g^{2+}+2 H g^{+} ) D. no equilibrium is established |
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| 204 | Transition metals are often para magnetic owing to A. high melting point and boiling point B. the presence of vacant orbitals C. the presence of unpaired electrons D. malleability and ductility |
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| 205 | ( (n-1) d^{10} n s^{2} ) is the general electronic configuration of: A. ( F e, C o, N i ) в. ( C u, A g, A u ) c. ( Z n, ) Cd ( , H g ) D. ( S e, Y, L a ) |
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| 206 | Maximum oxidation state exhibited by osmium is: ( A cdot+8 ) B. +7 ( c cdot+6 ) D. + 5 |
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| 207 | The correct order of the spin-only magnetic moment of metal ions in the following low spin complexes, ( left[boldsymbol{V}(boldsymbol{C N})_{6}right]^{4-},left[boldsymbol{F e}(boldsymbol{C} boldsymbol{N})_{6}right]^{4-} ) ( left.left[boldsymbol{R u}left(boldsymbol{N} boldsymbol{H}_{3}right)_{6}right]^{3+}, text { and }left[boldsymbol{C r}(boldsymbol{N} boldsymbol{H})_{3}right)_{6}right]^{2+}, ) is: A ( cdot V^{2+}>C r^{2+}>R u^{3+}>F e^{2+} ) B . ( V^{2+}>R u^{3+}>C r^{2+}>F e^{2+} ) c. ( C r^{2+}>V^{2+}>R u^{3+}>F e^{2+} ) D. ( C r^{2+}>R u^{3+}>F e^{2+}>V^{2}+ ) |
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| 208 | The ratio of number of exchange pairs present in ( d^{9} ) and magnetic moment of Cr in B.M. is:- ( A cdot frac{2}{sqrt{3}} ) B. ( frac{2 sqrt{3}}{3} ) c. ( frac{2 sqrt{3}}{4} ) D. ( frac{16}{sqrt{35}} ) |
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| 209 | Describe the preparation of potassium dichromate from iron chromite ore. What is the effect of increasing pH on a solution of potassium dichromate? |
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| 210 | Lanthanoid contraction is due to increase in: A. atomic number B. effective nuclear charge c. atomic radius D. valence electrons |
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| 211 | Complex forming ability will be minimum in : A. actinides B. lanthanides c. transition metals D. it will be almost same in all the three |
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| 212 | ( C r O_{5} ) forms addition compound with pyridine in the ethereal layer. The addition product is pentagonal pyramidal. A. True B. False |
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| 213 | Which of the following oxidation state is common for all lanthanides? ( A cdot+2 ) B. +3 ( c cdot+4 ) D. +5 |
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| 214 | ( mu=sqrt{15} ) is true for the pair: A ( cdot C o^{+2}, C r^{+3} ) B. ( F e^{+2}, C r^{+3} ) c. ( F e^{+3}, C r^{+2} ) D. ( M n^{+2}, F e^{+2} ) |
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| 215 | Question 34. Compare the general characteristics of the first series of the transition metals with that of the second and third series metals in the respective vertical columns. Give special emphasis on the following points: (1) Electronic configuration (i) Oxidation states (iii) Ionisation enthalpies (iv) Atomic sizes |
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| 216 | Which of the following catalysts is not correctly matched with the reaction? A. Vanadium (V) oxide in contact process for oxidation of ( S O_{2} ) to ( S O_{3} ) B. Finely divided iron in Habers process in conversion of ( N_{2} ) and ( H_{2} ) to ( N H_{3} ) C. ( P t C l_{2} ) catalyzes the oxidation of ethyne to ethanal in the Wacker process D. Ni in presence of hydrogen for conversion of vegetable oil to ghee |
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| 217 | Which of the following is not an actinoid ( ? ) ( A cdot A m ) B. ( mathrm{cm} ) ( c . F m ) D. Tm |
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| 218 | Give the composition of the following alloys: (a) German silver (b) Brass |
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| 219 | ( left(N H_{4}right)_{2} C r_{2} O_{7} ) (Ammonium dichromate) is used in fire works. The green coloured powder blown in air is : A. ( C r_{2} O_{3} ) в. ( C r O_{2} ) ( mathrm{c} cdot mathrm{Cr}_{2} mathrm{O}_{4} ) D. ( operatorname{Cr} mathrm{O}_{3} ) |
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| 220 | Potassium dichromate can be converted to potassium chromate by adding: ( mathbf{A} cdot K O H ) в. Conc.H( _{2} )SO( _{4} ) c. ( N H_{4} O H ) D. ( C H_{3} ) СООН |
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| 221 | Which of the following form an alloy? A. ( Z n+P b ) в. ( F e+H g ) c. ( P t+H g ) D. ( F e+C ) |
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| 222 | Which of the following statements for the reaction, is correct? ( N a_{2} C r O_{4}+H_{2} S O_{4} rightarrow ) A. It is a redox reaction in which green solution of ( left[C rleft(H_{2} Oright)_{6}right]^{+3} ) is produced. B. one of the product is reaction has trigonal planar structure c. Dimeric bridged tetrahedral metal ion is produced. D. Dark blue color in obtained in reaction |
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| 223 | Which of the following is coloured compound? A. ( C u F_{2} ) в. ( C u I ) c. ( N a C l ) D. ( M g C l_{2} ) |
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| 224 | What happens when ( left(N H_{4}right)_{2} C r_{2} O_{7} ) is heated? |
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| 225 | Platinum, palladium and iridium are called noble metals because: A. Alfred Nobel discovered them B. They are inert towards many common reagents C. They are shining, lustrous and pleasing to look at D. They are found in active state |
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| 226 | Question 24. Calculate the number of unpaired electrons in the following gaseous ions; Mnº+, Cr +, V+ and T13+. Which one of these is the most stable in aqueous solution? Write the electronic configuration of given ions to find the number of unpaired electrons. |
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| 227 | (a) Why Transition elements become paramagnetic? (b) Explain oxidization properties of potassium permanganate in acidic medium. (any four only) |
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| 228 | An aqueous solution containing ( boldsymbol{H} boldsymbol{g}_{2}^{2+}, boldsymbol{H} boldsymbol{g}^{2+}, boldsymbol{P b}^{2+}, boldsymbol{F} boldsymbol{e}^{2+} ) is treated with dil HCI. The cations that may be precipitate are This question has multiple correct options ( mathbf{A} cdot H g_{2}^{2+} ) B. ( H g^{2+} ) ( mathrm{c} cdot P b^{2} ) D. ( F e^{2} ) |
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| 229 | Transition elements does not show: A. paramagnetism B. colour c. fixed valency D. all of these |
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| 230 | Question 13. The second and third rows of transition elements resemble each other much more than they resemble the first row. Explain why? |
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| 231 | Compound that is both paramagnetic and coloured is: A. ( K_{2} C r_{2} O_{7} ) B. ( left(N H_{4}right)_{2}left[T i C I_{6}right] ) ( c cdot v o s O_{4} ) D. ( K_{3}left[C u(C N)_{4}right] ) |
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| 232 | ( boldsymbol{C u} boldsymbol{S O}_{4} ) is paramagnetic while ( boldsymbol{Z} boldsymbol{n} boldsymbol{S} boldsymbol{O}_{4} ) is diamagnetic because: A. ( C u^{2+} ) ion has ( 3 d^{9} ) configuration while ( Z n^{2+} ) ion has ( 3 d^{10} ) configuration B. ( C u^{2+} ) ion has ( 3 d^{5} ) configuration while ( Z n^{2+} ) ion has ( 3 d^{6} ) configuration. ( mathrm{c} cdot mathrm{Cu}^{2+} ) has half filled orbitals while ( Z n^{2+} ) has fully filled orbitals D. ( C u S O_{4} ) is blue in colour while ( Z n S O_{4} ) is white |
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| 233 | Which one of the following elements has the highest number of unpaired electrons? ( mathbf{A} cdot_{25} M n ) в. ( _{24} mathrm{Cr} ) ( mathbf{c} cdot_{96} C m ) ( D cdot 26 F e ) |
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| 234 | (a) Given reasons for the following: (i) ( M n^{3+} ) is a good oxidising agent (ii) ( E_{M^{2+} / M}^{circ} ) values are not regular for fist row transition metals (3 ( boldsymbol{d} ) series). (iii) Although ( F ) is more electronegative than ( O ), the highest ( M n ) fluoride is ( M n F_{4}, ) whereas the highest oxide is ( boldsymbol{M} boldsymbol{n}_{2} boldsymbol{O}_{7} ) (b) Complete the following equations: (i) ( 2 C r O_{4^{-}}^{2}+2 H^{+} rightarrow ) (ii) ( boldsymbol{K} boldsymbol{M} boldsymbol{n} boldsymbol{O}_{4} stackrel{boldsymbol{Delta}}{longrightarrow} ) |
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| 235 | What are ( boldsymbol{f} ) -block elements? Distinguish between lanthanoid and actinoid. |
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| 236 | Assertion Transition metals are weak reducing agents. Reason Due to high heat of sublimation, high ionization energy and low ( boldsymbol{E}_{boldsymbol{R} . boldsymbol{P}}^{boldsymbol{0}} ) Read the above assertion and reason and choose the correct option regarding ¡t. 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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| 237 | Number of moles of ( K_{2} C r_{2} O_{7} ) require to reduce one mole of ( S n^{2+} ) ions is ( A cdot 1 / 3 ) B. 3 ( c cdot 1 / 6 ) D. 6 |
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| 238 | Which element is a transition metal? A. melting point in ( ^{circ} C-98 ; ) density in ( g / c m^{3}-1.0 ; ) colour of oxide – white B. melting point in ( ^{circ} C-328 ; ) density in ( g / c m^{3}-11.3 ; ) colour of oxide – yellow C. melting point in ( ^{circ} C-651 ); density in ( g / c m^{3}-1.7 ; ) colour of oxide – white D. melting point in ( ^{circ} C ) – 1240; density in ( g / mathrm{cm}^{3}-7.4 ) colour of oxide – black |
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| 239 | Many Lanthanoid elements are used to prepare A . ceramic materials B. water softener c. superconducting materials D. enzyme catalysts |
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| 240 | Across the lanthanide series, the basicity of the lanthanide hydroxides? A. Increases B. Decreases c. First increase and then decrease D. First decrease and then increase |
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| 241 | The magnetic moment of a transition metal ion is ( sqrt{15} B M . ) Therefore, the number of unpaired electrons present in it is: A . 4 B. ( c cdot 2 ) D. 3 |
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| 242 | In which compounds does vanadium have an oxidation number of ( +4 ? ) A. ( N H_{4} V O_{2} ) B . ( K_{4}left[V(C N)_{6}right] ) ( c cdot v o s O_{4} ) D. ( operatorname{Cr} mathrm{O}_{2} mathrm{Cl}_{2} ) |
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| 243 | Which one of the following forms a colourless solution in an aqueous medium? [Atomic number ( boldsymbol{S c}=mathbf{2 1}, boldsymbol{T} boldsymbol{i}= ) ( mathbf{2 2}, boldsymbol{V}=mathbf{2 3}, boldsymbol{C r}=mathbf{2 4}] ) ( mathbf{A} cdot V^{3} ) в. ( C r^{3} ) ( c cdot T i^{3} ) D. ( S c^{3} ) |
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| 244 | Pitch-Blende is the source of some metals. Find the total No. of such metals among these: ( [boldsymbol{H} boldsymbol{g}, boldsymbol{R} boldsymbol{a}, boldsymbol{U}, boldsymbol{T} boldsymbol{h}, boldsymbol{Z} boldsymbol{n}, boldsymbol{T} boldsymbol{c}] ) |
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| 245 | Which of the following is not an actinoid? A. Carium( (Z=96) ) B. Californium(Z = 98) c. Uranium( (Z=92) ) D. Terbium( ( Z=65 ) ) |
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| 246 | The nature of ( boldsymbol{F e}_{2} boldsymbol{O}_{3} ) is: A . acidic B. basic c. amphoteric D. none of these |
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| 247 | Which represents correct comparison of the stability of ions? A. ( M n O_{4}^{-}<M n^{2+} ) B. ( C r^{2+}<C r^{3} ) c. ( C r O_{4}^{2-}<C r^{3+} ) D. All of these |
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| 248 | A sulphate of a metal (M) on healing evolves two gases ( (mathrm{B}) ) and ( (mathrm{C}) ) and an oxide (D). Gas (B) turns acidified dichromate paper green while gas ( (mathrm{C}) ) forms a trimer. Compound (D) forms a Lewis acid (E) with HCI (g). If, the number of ( S ) -S bonds in trimer of gas (C) be ‘n’ and the number of equivalent M-Cl bonds in one molecule of anhydrous (E) be ‘m’, Then, ( (m+n) ) is: |
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| 249 | Which of the following has ( n s^{2} n p^{6} n d^{10} ) ( (n+1) s^{0} ) configuration? A. ( P d ) в. ( A g^{+} ) c. ( C d^{+2} ) D. All of the above |
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| 250 | Among the Lanthanoids, the one obtained by synthetic method is: A . ( L u ) в. ( P r ) c. ( P m ) D. ( G d ) |
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| 251 | The actinoids exhibit more number of oxidation states in general than the lanthanoids. This is because: A. the ( 5 f ) orbitals are more buried than the ( 4 f ) orbitals B. there is a similarity between 4 f and 5 f orbitals in their angular part of the wave function c. the actinoids are more reactive than the lanthanoids D. the 5 f orbitals extend further from the nucleus than the ( 4 f ) orbitals |
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| 252 | Question 9. Explain why Cut ion is not stable in aqueous solutions | 12 |
| 253 | A solution of ( K M n O_{4} ) is reduced to various products depending upon its pH. At pH ( 7 it gives a green solution (C) ( (A),(B) ) and ( (C) ) are : A ( cdot(A)-M n^{2+},(B)-M n O_{2}(C)-M n O_{4}^{2-} ) B . ( (A)-M n O_{2},(B)-M n^{2+},(C)-M n O_{4}^{2} ) c. ( (A)-M n^{2+},(B)-M n O_{4}^{2-},(C)-M n O_{2} ) D. ( (A)-M n O_{4}^{2-},(B)-M n^{2+},(C)-M n O_{2} ) |
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| 254 | The actinide contraction is due to: A. perfect shielding of ( 5 f ) election B. imperfect shielding of ( 4 f ) election C. imperfect shielding of ( 5 f ) electron D. perfect shielding of ( 4 f ) election |
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| 255 | ( A C r O_{4}^{2-} ) solution turns from yellow to another color upon addition of acid. What is the another color? A. Pink B. Green c. white D. orange |
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| 256 | (i) ( underset{boldsymbol{a} boldsymbol{q} cdot boldsymbol{s u s p e n s i o n}}{boldsymbol{B} boldsymbol{a} boldsymbol{C O}_{3}}+boldsymbol{N} boldsymbol{a}_{2} boldsymbol{C r} boldsymbol{O}_{4}+ ) ( boldsymbol{A c O H} rightarrow underset{p p t}{boldsymbol{H}} ) (ii) ( boldsymbol{B a C O}_{3}+boldsymbol{N a}_{2} boldsymbol{C r} boldsymbol{O}_{4}+ ) aq.suspension ( boldsymbol{H} boldsymbol{C} boldsymbol{N} rightarrow underset{p p t}{boldsymbol{N}} ) Which is the correct option regarding the given reactions? A. ( mathrm{M} ) and ( mathrm{N} ) are the same and characterized as ( B a C r O_{4} ) B. ( mathrm{M} ) is ( mathrm{BaCrO}_{4} ) and ( mathrm{N} ) stands for no precipitate c. ( mathrm{M} ) is ( mathrm{BaCrO}_{4} ) and ( mathrm{N} ) is ( mathrm{BaCO}_{3} ) D. M stands for no precipitate and ( mathrm{N} ) is ( mathrm{BaCrO}_{4} ) |
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| 257 | by 0.46 A sole 16 A solution of KMnO, on reduction yields either a colourless solution or a brown precipitate or a green solution depending on pH of the solution. What different stages of the reduction do these represent and how are they carried out? |
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| 258 | Question 4. To what extent do the electronic configurations decide the stability of oxidation states in the first series of the transition elements Illustrate your answer with examples. |
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| 259 | Filled Q.53 Match the compounds elements given in Column I with uses given in Column II. SO 1. Column 1 (Compound/element) Lanthanoid oxide Lanthanoid Misch metall Magnesium based alloy is constituent of Mixed oxides of lanthanoids are employed A. B. C D. E 2. 3. 4. Column II (Use) Production of iron alloy Television screen Petroleum cracking Lanthanoid metal + iron Bullets X-ray screen 6. |
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| 260 | The magnetic moment of ( left[boldsymbol{C u}left(boldsymbol{N} boldsymbol{H}_{3}right)_{4}right]^{2+} ) was found to be 1.73 B.M. The number of unpaired electrons in the complex is: ( A cdot O ) B. ( c cdot 2 ) ( D cdot 3 ) |
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| 261 | Isotope of which metal is used in cancer therapy? A . ( R a ) в. ( N i ) c. ( P_{o} ) D. ( C o ) |
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| 262 | Which of the following oxidation state is common for all lanthanides? ( A cdot+2 ) B. +3 ( c cdot+4 ) D. +5 |
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| 263 | The pair, that referred as ‘chemical twins’ is. ( A cdot A c, C f ) B. Hf, Ta c. Tc, Re D. La, Acc |
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| 264 | ( F e^{3+} ) compounds are more stable than ( F e^{2+} ) compounds because: A. ( F e^{3+} ) has smaller size than ( F e^{2+} ) B. ( F e^{3+} ) has ( 3 d^{5} ) configuration (half-filled) C. ( F e^{3+} ) has higher oxidation state D. ( F e^{3+} ) is paramagnetic in nature |
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| 265 | Passivity of iron is due to formation of: A. ( F e_{2} O_{3} ) в. ( F e_{3} O_{4} ) ( mathrm{c} cdot mathrm{FeSO}_{4} ) D. none of these |
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| 266 | The inner transition elements are the elements in which last electrons enters into: ( A cdot(n-1) ) d-orbitals B. (n-2) f-orbitals C. ( (n-1) ) d-orbitals and ( (n-1) ) f-orbitals D. ( (n-1) ) d-orbitals and ns orbitals |
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| 267 | Common oxidation state of Scandium ¡s/are: ( A cdot+4 ) B. +1 ( c cdot+3 ) D. +4 and +1 |
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| 268 | Which of the following statement(s) is (are) not correct with reference to ferrous and ferric ions? A ( cdot F e^{3+} ) gives brown colour with potassium ferricyanide B. ( F e^{2+} ) gives blue ppt with potassium ferricyanide C ( cdot F e^{3+} ) gives red colour with potassium sulphocyanide D. ( F e^{2+} ) gives brown colour with potassium sulphocyanide |
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| 269 | Ammonia forms a complex ion ( left[boldsymbol{C u}left(boldsymbol{N} boldsymbol{H}_{3}right)_{4}right]^{2+} ) with copper ions in alkaline solutions but not in acidic solutions. What is the reason for it? A. Copper hydroxide is an amphoteric substance. B. In acidic solutions, hydration protects copper ions. C. In acidic solutions, protons coordinate with ammonia molecules forming ( N H_{4}^{+} ) ions and ( N H_{3} ) molecules are no longer available for co-ordination to metal ions. D. In alkaline solutions, insoluble ( C u(O H)_{2} ) is precipitated out which is soluble in excess of any alkali |
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| 270 | In which of the following pairs of ions, the lower oxidation state in aqueous solution is more stable than the other? ( mathbf{A} cdot T i^{+}, T i^{3+} ) B. ( C u^{+}, C u^{2+} ) c. ( C r^{+}, C r^{3+} ) D. None of these |
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| 271 | There are 14 elements in actinoid series. Which of the following elements does not belong to this series? A. ( U ) в. ( N p ) ( c . T m ) D. ( P m ) |
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| 272 | Which of the following belongs to the actinoids series of elements? A. ( Y ) в. ( T a ) ( c cdot U ) D. ( P ) |
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| 273 | Question 3. Why first ionisation enthalpy of Cr is lower than that of Zn? |
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| 274 | The colored complexes of the transition elements have color because they: A. have very high formation constants B. absorb light of some visible wavelengths C. absorb light of some ultraviolet wavelengths D. have unpaired electrons E. are soluble in water |
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| 275 | Chlorine is liberated when we heat: A. ( K M n O_{4}+N a C l ) В ( cdot P b_{2}left(N O_{3}right)_{4}+M n O_{2} ) c. ( K_{2} C r_{2} O_{7}+M n O_{2} ) D. ( K_{2} C r_{2} O_{7}+H C l ) |
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| 276 | Assertion In 5 th period, an element with ( Z=57 ) is followed by element ( Z=72 ) Reason The intermediate elements are not represented in the main body of 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. Both Assertion and Reason are incorrect |
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| 277 | The value of the magnetic moment of a particular ion is 2.83 Bohr magneton. The ion is : A ( cdot F e^{2} ) B. ( N i^{2} ) ( mathbf{c} cdot M n^{2+} ) D. ( C o^{3} ) |
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| 278 | In the transition elements the incoming electron occupies ( [n-1] ) d sublevel in preference to ( A cdot n p ) B. ns c. [n-1]d D. ( [n+1] s ) |
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| 279 | Question 23. Which metal in the first series of transition metals exhibits +1 oxidation state most frequently and why? |
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| 280 | Write the ionic equation showing the oxidation of ( F e(I I) ) salt by acidified dichromate solution. | 12 |
| 281 | Salt of which of the elements are mostly blue in colour? A. cu B. zn c. ( mathrm{Fe} ) D. cr |
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| 282 | Which of the following is not true about transition metals? A. They are diamagnetic substances B. They are paramagnetic substances C. They can form complexes D. They can show variable oxidation states |
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| 283 | The actinoids showing +7 oxidation state are: A. ( U, N p ) в. ( P u, A m ) c. ( N p, P u ) D. ( A m, C m ) |
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| 284 | What is correct order of size in each pair given below? ( N b^{3+} ) and ( T a^{3+} ) A. ( N b^{3+}=T a^{3+} ) B . ( N b^{3+}T a^{3} ) D. None of these |
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| 285 | The orange solution of ( boldsymbol{K}_{2} boldsymbol{C r}_{2} boldsymbol{O}_{7} ) turns yellow on adding NaOH to it .If true enter else 0 ( A ) |
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| 286 | Iron sheets are covered with a layer of Zinc i.e., galvanized mainly to A. harden the surface B. increase the surface c. prevent action of water only D. prevent action of oxygen and water |
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| 287 | Select the correct option, among ( boldsymbol{S} boldsymbol{c}(boldsymbol{I} boldsymbol{I} boldsymbol{I}), boldsymbol{T} boldsymbol{i}(boldsymbol{I} boldsymbol{V}), boldsymbol{P} boldsymbol{d}(boldsymbol{I} boldsymbol{I}) ) and ( boldsymbol{C} boldsymbol{u}(boldsymbol{I} boldsymbol{I}) ) ions. A. All are paramagnetic c. ( S c(I I I), T i(I V) ) are paramagnetic and ( P d(I I I), C u(I I) ) are diamagnetic D. ( S c(I I I), T i(I V) ) are diamagnetic and ( P d(I I), C u(I I) ) are paramagnetic |
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| 288 | Which of the following oxidation states is the most common among the lanthanoids? ( A cdot 4 ) B. 2 ( c cdot 5 ) D. |
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| 289 | Compare the stability of +2 oxidation state for the elements of the first transition series. |
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| 290 | Arrange ( C e^{3+}, L a^{3+}, P m^{3+}, ) and ( Y b^{3+} ) in increasing order of their ionic radius: A ( cdot Y b^{3+}<P m^{3+}<C e^{3+}Y b^{3+}<P m^{3+}P m^{3+}<L a^{3+}<C e^{3+} ) D. none of these |
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| 291 | The radius of ( L a^{3+} ) (Atomic number of ( boldsymbol{L} boldsymbol{a}=mathbf{5} mathbf{7}) ) is ( mathbf{1 . 0 6} boldsymbol{A} . ) Which one of the following given values will be closest to the radius of ( L u^{3+} ) (Atomic number of ( boldsymbol{L} boldsymbol{u}=mathbf{7} 1) ? ) A ( .1 .40 AA ) В. 1.06 А c. ( 0.85 dot{A} ) D. 1.60 月 |
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| 292 | In the dichromate anion ( C r_{2} O_{7} ) A. all Cr- O bonds are equivalent B. ( 6 mathrm{cr} ) – 0 bonds are equivalent c. ( 3 mathrm{cr} ) -o bonds are equivalent D. no bonds in ( C r_{2} O_{7} ) are equivalent |
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| 293 | When ( mathrm{CO}_{2} ) is passed into aqueous This question has multiple correct options ( mathbf{A} cdot mathrm{Na}_{2} mathrm{CrO}_{4} ) solution, its yellow colour changes to orange B. ( mathrm{K}_{2} mathrm{MnO}_{4} ) solution, it disproportionates to ( mathrm{KMnO}_{4} ) and ( mathrm{MnO}_{2} ) ( mathrm{C} cdot mathrm{Na}_{2} mathrm{Cr}_{2} mathrm{O}_{7} ) solution, its orange colour changes to green D. ( mathrm{KMnO}_{4} ) solution, its pink colour changes to green |
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| 294 | The basic character of the transition metal monoxides follows the (At. no. of ( boldsymbol{T} boldsymbol{i}=mathbf{2} 2, boldsymbol{V}=mathbf{2 3}, boldsymbol{C r}= ) ( 24, F e=26) ) A ( . T i O>V O>C r O>F e O ) в. ( V O>C r O>T i O>F e O ) ( mathrm{c} cdot mathrm{Cr} mathrm{O}>mathrm{VO}>mathrm{FeO}>mathrm{TiO} ) D. ( T i O>F e O>V O>C r O ) |
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| 295 | What is meant by lanthanoid contraction? The actinoid contraction is grater than that of lanthanoid contraction. Why? |
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| 296 | Of the following metals, the most reactive metal is: A . ( F e ) в. ( N i ) ( c cdot P t ) D. ( A u ) |
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| 297 | The highest oxidation state of a transition metal is usually exhibited in its oxide and fluoride. | 12 |
| 298 | 42. The lightest radioactive element is (1) deuterium (3) tritium (2) polonium (4) uranium |
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| 299 | The common oxidation state of elements of lanthanide series is ( A cdot+1 ) ( B cdot+3 ) ( c cdot+4 ) ( D cdot+6 ) |
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| 300 | Choose the correct alternative: (a) Alloys of metals usually have (greater/less) resistivity than that of their constituent metals. (b) Alloys usually have much (lower/higher) temperature coefficients of resistance than pure metals. (c) The resistivity of the alloy manganin is nearly independent of increases rapidly with increase of temperature (d) The resistivity of a typical insulator (e.g., amber) is greater than that of a metal by a factor of the order of ( left.mathbf{1 0}^{mathbf{2 2}} / mathbf{1 0}^{mathbf{3}}right) ) |
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| 301 | ( boldsymbol{K} boldsymbol{B r}+boldsymbol{M n O}_{2}+boldsymbol{H}_{2} boldsymbol{S O}_{4}(text {conc.}) longrightarrow ) ( boldsymbol{K} boldsymbol{H} boldsymbol{S} boldsymbol{O}_{mathfrak{S}}+boldsymbol{M} boldsymbol{n} boldsymbol{S} boldsymbol{O}_{4}+boldsymbol{H}_{2} boldsymbol{O}+[boldsymbol{X}] ) (unbalanced equation). Which statement is/are correct? This question has multiple correct options A. ( X ) turns starch paper orange red B. ( X ) with ( A g N O_{3} ) solution gives a pale yellow ppt. which ‘s completely soluble in excess ammonium hydroxide c. ( X ) produces violet colour in organic layer in ( K I ) solution D. ( X ) is liberated when a mixture of ( K B r, K_{2} C r_{2} O_{7} ) and conc. ( H_{2} S O_{4} ) is heated |
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| 302 | The oxidation number of Mn in the product of alkaline oxidative fusion of ( M n O_{2} ) is: |
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| 303 | Q. 68 (a) Answer the following questions (0 Which element of the first transition series has highest second ionisation enthalpy? (11) Which element of the first transition series has highest third ionisation enthalpy? (iii) Which element of the first transition series has lowest enthalpy of atomisation? (b) Identify the metal and justify your answer. (i) Carbonyl M(CO). (ii) MO,F |
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| 304 | Cigarette gas lighter is made up of: A. Noble metal B. Alkali metal c. Misch metal D. None of these |
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| 305 | Which of the following represents the electronic configuration of d-block elements? A ( cdot(n-1) s^{2} n d^{1-10} ) B . ( (n-1) d^{1-10} n s^{1-2} ) C ( cdot(n-1) s^{2} p^{6} n s^{1} ) D. ( n s^{2} p^{2} d^{1} ) |
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| 306 | General electronic configuration of inner transition element is |
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| 307 | Does ( C u^{+} ) ion show colour? | 12 |
| 308 | Which of the following statements is correct regarding actinides? A. All are synthetic elements B. Include element 104 c. Have only short lived isotopes D. Have variable valency |
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| 309 | The INCORRECT statement is: A. The spin – only magnetic moments of ( left[mathrm{Fe}left(mathrm{H}_{2} mathrm{O}right)_{6}right]^{2+} ) and ( left[C rleft(H_{2} Oright)_{6}right]^{2+} ) are nearly similar B. The spin-only magnetic moment of ( left[N ileft(N H_{3}right)_{4}left(H_{2} Oright)_{2}right]^{2+} ) is ( 2.83 B M ) C. The gemstone, ruby, has ( C r^{3+} ) ions occupying the octahedral sites of beryl D. The color of ( left[mathrm{CoCl}left(mathrm{NH}_{3}right)_{5}right]^{2+} ) is violet as it absorbs the yellow light |
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| 310 | Which is the coloured ion? ( mathbf{A} cdotleft[C u(C N)_{4}right]^{3} ) B . ( left[S cleft(H_{2} Oright)_{6}right]^{3+} ) ( mathbf{c} cdotleft[M nleft(H_{2} Oright)_{6}right]^{3+} ) D. All of these |
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| 311 | What is meant by Lanthanide contraction? Write the general electronic configuration of inner transition elements. |
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| 312 | Match the column I with column II and mark the appropriate choice. ” Column I An element which ( (A) ) ( 1+8 ) can show (i) oxidation state An element with ( 7+ ) (B) as the most stable (ii) ( P m ) oxidation state in its oxides Radioactive (iii) 0 ( mathcal{D}_{mathcal{S}} ) (C) Ianthanoid Lanthanoid which (D) shows shows +4 oxidation state 4 (iv) ( M n ) ( mathbf{A} cdot(A) rightarrow(i),(B) rightarrow(i i),(C) rightarrow(i i i),(D) rightarrow(i v) ) B ( cdot(A) rightarrow(i i),(B) rightarrow(i i i),(C) rightarrow(i v),(D) rightarrow(i) ) C ( cdot(A) rightarrow(i v),(B) rightarrow(i),(C) rightarrow(i i),(D) rightarrow(i i i) ) D. ( (A) rightarrow(i i i),(B) rightarrow(i v),(C) rightarrow(i i),(D) rightarrow(i) ) |
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| 313 | Which of the following oxide has the maximum basicity? A. ( operatorname{Pr}_{2} ) O ( _{3} ) в. ( L a_{2} O_{3} ) ( mathrm{c} cdot mathrm{Sm}_{2} mathrm{O}_{3} ) D. ( G d_{2} O_{3} ) |
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| 314 | Write the different oxidation states of manganese.Why +2 oxidation state of manganese is more stable? |
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| 315 | Assertion Melting point of ( M n ) is more than that of ( boldsymbol{F e} ) Reason Mn has higher number of unpaired ( e^{-} ) than ( F e ) in atomic state 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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| 316 | Write the uses of Lanthanides and Actinides. |
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| 317 | Gallium is in room temperature. A. plasma B. liquid c. solid D. gaseous |
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| 318 | Lanthanoid for which +2 and +3 oxidation states are common is: A . La B. Eu ( c cdot c e ) D. Nd |
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| 319 | Which of the following has the maximum number of unpaired ( d ) electrons? A ( cdot Z n^{2} ) B. ( F e^{2+} ) ( c cdot N i^{3} ) D. ( C u^{+} ) |
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| 320 | 0.37 Out of Cu Cl, and CuCl2, which is more stable and why? anal and CUCCucii |
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| 321 | Question 16. Reactivity of transition regularly from Sc to Cu. Explain. elements decreases almost |
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| 322 | Which one of the following shows highest magnetic moment? A ( cdot F e^{2} ) в. ( C o^{2} ) ( c cdot C r^{3} ) D. ( N i^{2} ) |
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| 323 | Maximum ferromagnetism is found in? A . ( F e ) в. ( N i ) c. ( C o ) D. None |
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| 324 | The lanthanide element that has the electronic configuration ( [boldsymbol{X} boldsymbol{e}] boldsymbol{4} boldsymbol{f}^{7} boldsymbol{5} boldsymbol{d}^{1} boldsymbol{6} boldsymbol{s}^{2} ) is: A. Lutetium B. Terbium c. Ytterbium D. Gadolinium |
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| 325 | The colour of ( _{62} S m^{3+} ) is yellow. The colour of ( _{66} D y^{3+} ) is: A. colourless B. yellow c. red D. blue |
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| 326 | Match the catalysts to the correct processes: Catalyst ( quad ) Process A. ( T i C l_{3} ) ¡. Wacker process ii. Ziegler – Natta B. ( P d C l_{2} quad ) polymerization С. ( C u C l_{2} ) iii. Contact process D. ( V_{2} O_{5} ) ¡v. Deacon’s process ( A cdot(A)-(i i i),(B)-(i i),(C)-(i v),(D)-(i) ) B. (A) – (ii), (B) – (i), (C) – (iv), (D) – (iii) C. ( (A)-(text { ii) },(B)-(text { iii) },(C)-(i v),(D)-(i) ) D. (A) – (iii), (B) – (i), (C) – (ii), (D) – (iv) |
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| 327 | A dilute ferrous sulphate solution was gradually added to the beaker containing acidified potassium permanganate solution. The light purple colour of the solution fades and finally disappears. Which of the following is the correct explanation for the observation? A ( cdot K M n O_{4} ) is an oxidising agent, and it oxidies ( F e S O_{4} ) B. ( F e S O_{4} ) acts as an oxidising agent and oxidises ( K M n O_{4} ) C. The colour disappear due to dilution; no reaction is involved D. ( K M n O_{4} ) is an unstable compound and decomposes is presence of ( F e S O_{4} ) to a colourless compound |
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| 328 | The properties of ( Z r ) and ( H f ) are similar because: A. both belong to d-block B. both belong to same group of the periodic table c. both have similar radii D. both have same number of electrons |
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| 329 | Select incorrect statement. A. Ionisation energies of 5d-elements are greater than those of ( 3 d ) and ( 4 d ) elements. B. Cu(l) is diamagnetic while Cu(II) is paramagnetic. ( mathbf{c} cdotleft[T ileft(H_{2} Oright)_{6}right]^{3+} ) is coloured while ( left[S cleft(H_{2} Oright)_{6}right]^{3+} ) colourless. D. Transition elements cannot form complexes. |
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| 330 | The colour of ( C u C r_{2} O_{7} ) solution in water is green because A ( cdot C u^{2+} ) ion is green в. ( C r_{2} O_{7}^{2} ) c. both the ions are green D. ( C u^{2+} ) ion is blue and ( C r_{2} O_{7}^{2-} ) ion is yellow |
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| 331 | The stable oxidation states of Cr are: ( A cdot+3,+6 ) ( B cdot+3,+4 ) ( c cdot+1,+4 ) ( D cdot+2,+5 ) |
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| 332 | 2 ans. 26 General electronic configuration of actinoids is (n-2) f 1-14 (n-1) d Which of the following actinoids have one electron in 6d orbital? (a) U (Atomic number. 92) (b) Np (Atomic number. 93) (c) Pu (Atomic number. 94) (d) Am (Atomic number. 95) |
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| 333 | Elements which generally exhibit variable oxidation states and form colored ions are A. metalloids B. transition elements c. non-metals D. gases |
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| 334 | Number of d-electrons in chromium of ( left[C rleft(H_{2} Oright)_{6}right]^{+3} ) ion are: ( A ) B. 2 ( c cdot 3 ) D. 4 |
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| 335 | 31 The electronic configuration of valence shell of Cu is 3d 10 451 and not 3d 4s?. How is this configuration explained? |
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| 336 | With regard to the exhibiting oxidation states the correct statement would be: A. Lanthanides form largest number of oxidation states B. Actinides form largest number of oxidation states c. Lanthanides and actinides have almost same tendency to exhibit various oxidation states D. Actinides exhibit least number of oxidation states |
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| 337 | Which of the following cannot form oxo ion? ( mathbf{A} cdot P u O_{2}^{+} ) B. ( mathrm{CeO}_{2}^{+} ) ( mathbf{c} cdot U O_{2}^{2+} ) D. ( N p O_{2}^{text {th }} ) |
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| 338 | The magnetic moment of ( boldsymbol{K}_{mathbf{2}}left[boldsymbol{M} boldsymbol{n} boldsymbol{C l}_{4}right] ) corrected to the nearest integer is ( mathbf{A} cdot 6 B M ) в. ( 7 B M ) ( mathbf{c} cdot 8 B M ) D. ( 5 B M ) |
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| 339 | Which of the following represents the oxide of cerium? This question has multiple correct options A. ( C e_{3} O_{4} ) в. ( C e O_{4} ) ( mathrm{c} cdot mathrm{Ce}_{2} mathrm{O}_{3} ) D. ( operatorname{Ce} mathrm{e}_{2} ) |
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| 340 | Which of the following elements does not show +4 oxidation state? A ( . Z r ) в. ( P t ) c. ( L a ) D. ( T i ) |
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| 341 | The magnetic moment of ( left[boldsymbol{C o}left(boldsymbol{N} boldsymbol{H}_{3}right)_{6}right] boldsymbol{C l}_{3} ) is: A . 1.73 в. 2.83 c. 6.6 D. zero |
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| 342 | For given reaction: ( boldsymbol{C r}_{2} boldsymbol{O}_{7}^{2-} stackrel{boldsymbol{H}^{+}}{longrightarrow} boldsymbol{C r}^{3} ) Eq.wt of ( boldsymbol{C r}_{2} boldsymbol{O}_{7}^{2-} ) is: A. mol. wt. ( / 6 ) B. mol. wt./3 c. mol. wt. ( / 4 ) D. mol. wt./1 |
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| 343 | Consider following complexes: I: ( left[boldsymbol{F e}left(boldsymbol{H}_{2} boldsymbol{O}right)_{6}right]^{2+} ) ( |:left[boldsymbol{F} boldsymbol{e}(boldsymbol{C} boldsymbol{N})_{boldsymbol{6}}right]^{4-} ) ( | I:left[N i(C O)_{4}right] ) ( mid V:left[N ileft(H_{2} Oright)_{4}right]^{2+} ) ( mathbf{V}:left[boldsymbol{N} boldsymbol{i}(boldsymbol{C} boldsymbol{N})_{4}right]^{2-} ) Out of this, select the complex with equal number of unpaired electrons: ( mathbf{A} cdotleft[F eleft(H_{2} Oright)_{6}right]^{2+} ) B ( cdotleft[N i(C O)_{4}right] ) c. ( left[N ileft(H_{2} Oright)_{4}right]^{2+} ) D. None of these |
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| 344 | Among ( boldsymbol{V}(boldsymbol{Z}=mathbf{2 3}), boldsymbol{C r}(boldsymbol{Z}=mathbf{2 4}) ) ( M n(Z=25) ) and ( F e(Z=26), ) which will have the highest magnetic moment? A. ( V ) в. ( C r ) ( c . M n ) D. ( F e ) |
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| 345 | Misch metal is: A. an alloy of lathanide and copper B. an alloy of lanthanide and nickel C . an alloy of lathanide,iron and carbon D. an alloy of calcium and copper |
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| 346 | The ionic radius of ( _{57} L a^{3+} ) is ( 1.06 mathrm{A} ) Which one of the following given values will be closest to the ionic radius of ( mathbf{7}_{1} boldsymbol{L} boldsymbol{u}^{mathbf{3}+} ? ) A . 1.06 A B. 1.56 A c. ( 0.85 mathrm{A} ) D. 1.35 A |
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| 347 | The aqueous solution containing which one of the following ions will be colourless: A ( cdot F e^{2} ) B. ( M n^{2+} ) ( c cdot T i^{3} ) ( mathrm{D} cdot mathrm{Sc}^{3} ) |
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| 348 | Which of the following metal oxides is white in colour but becomes yellow on heating? A. ( A g_{2} O ) в. ( Z n O ) c. ( F e O ) D. ( M g O ) |
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| 349 | Choose the correct answer from the alternative given. When an oxide of manganese (P) is fused with KOH in the presence of an oxidizing agent and dissolved in water, it gives a dark green solution of compound (Q). Compound (Q) disproportionates in neutral or acidic solution to give purple compound (R). An alkaline solution of compound (R) oxidizes potassium iodide solution to a compound (S) and compound (P) is also formed. Compounds ( P ) to ( S ) are: A ( cdot(P)-M n O_{4}^{-},(Q)-K I O_{3},(R)-M n O_{2},(S)- ) ( K_{2} M n O_{4} ) B . ( (P)-M n O_{2},(Q)-K_{2} M n O_{4},(R)-M n O_{4}^{-},(S)- ) ( K I O_{3} ) C ( cdot(P)-M n O_{2},(Q)-M n O_{4}^{-},(R)-K 2 M n O_{4},(S) ) ( K I O_{3} ) D ( cdot(P)-K_{2} M n O_{4},(Q)-M n O_{2},(R)-M n O_{4}^{-},(S)- ) ( K I O_{3} ) |
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| 350 | What may be the stable oxidation state of the transition element with the following delectron configurations in the ground state of their atoms: ( 3 d^{3}, 3 d^{5}, 3 d^{8} ) and ( 3 d^{4} ? ) |
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| 351 | Total number of inner transition elements in the periodic table is: A . 10 B. 14 ( c cdot 28 ) D. 30 |
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| 352 | The colour of ( C r O_{4}^{2-} ) is due to: A. charge tranfer. B. d-d transition. c. it does not shows colour. D. none of the above |
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| 353 | For ( M^{2+} / M ) and ( M^{3+} / M^{2+} ) systems the ( E^{ominus} ) values for some metals are as follows: ( C r^{3} / C r^{2+} ) ( boldsymbol{C r}^{2+} / boldsymbol{C r} quad_{boldsymbol{$}}^{-boldsymbol{0 . 9} boldsymbol{V}} ) ( / M n quad-1.2 V ) ( M n^{3+} ) ( M n^{2+} ) ( / M n^{2+} ) ( -0.4 V ) ( F e^{3+} / F e^{2+} ) Use this data to comment upon: (i) the stability of ( F e^{3+} ) in acid solution as compared to that of ( C r^{3+} ) or ( M n^{3+} ) and (ii) the ease with which iron can be oxidised as compared to a similar process for either chromium or manganese metal |
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| 354 | Of the ions ( A g^{+}, C o^{+2} ) and ( T i^{+4} ) which one will be coloured in aqueous solution? |
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| 355 | Explain why: ( C u^{+} ) is diamagnetic but ( C u^{2+} ) is paramagnetic. ( (Z=29) ) |
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| 356 | Each question below consists of two statements. I in the left-hand column and II in the right-hand For each question. determine whether statement is true or false and whether statement II is true or false. I: Potassium permanganate is a colored compound. Il: Both potassium and manganese are metals. A. Both statements are true B. Statement I is true and Statement II is false c. Statement II is true and Statement I is false D. Both Statements are false |
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| 357 | Most transition metals- I: forms sets of compounds that display different oxidation states of the metal. Il: form colored ions in solution III: burn vigorously in oxygen IV: replace ( H_{2} ) from dilute acids of these A. I, II, III are correct B. II, III, Iv and correct C. I, II are correct D. all are correct |
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| 358 | Explain with reasons: (i) Transition elements show variable oxidation states (ii) Transition elements form coloured compounds. (iii) The size of Lanthanide elements decreases from La to Lu. |
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| 359 | A complex compound of cobalt has molecular formula containing five ( boldsymbol{N} boldsymbol{H}_{3} ) molecules, one ( N O_{2} ) group and two ( C l ) atoms for one ( C ) otom. One mole of this compound produces three moles of ions in aqueous solution. On reacting with an excess of ( A g N O_{3} ) solution, two moles of ( A g C l ) get precipitated. The ionic formula of the compound is: ( mathbf{A} cdotleft[operatorname{Co}left(N H_{3}right)_{4} N O_{2} C lright]left[left(N H_{3}right) C lright] ) B ( cdotleft[operatorname{Co}left(N H_{3}right)_{5} C lright]left[C lleft(N O_{2}right)right. ) ( mathbf{c} cdotleft[operatorname{Co}left(N H_{3}right)_{5}left(N O_{2}right)right] C l_{2} ) D. ( left[operatorname{Co}left(N H_{3}right)_{5}right]left[left(N O_{2}right) C l_{3}right] ) |
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| 360 | ( ln S c^{3+}, T i^{2+}, T i^{3+}, V^{2+}, ) increasing order of spin only magnetic moment is: A. ( S c^{3+}<T i^{2+}<T i^{3+}<V^{2+} ) B. ( S c^{3+}<T i^{3+}<T i^{2+}<V^{2+} ) c. ( T i^{2+}<S c^{3+}<T i^{3+}<V^{2+} ) D. ( S c^{3+}<T i^{2+}<V^{2+}<T i^{3+} ) |
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| 361 | Which of the following is natural element? A. Pm B . La c. Pu D. Np |
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| 362 | Neptunium is radioactive and emits a beta particle and gives: A. plutonium B. uranium c. californium D. curium |
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| 363 | Which of the following statements are true for Mohr’s salt? This question has multiple correct options A . it decolourizes ( K M n O_{4} ) solution B. it is a double salt ( mathrm{c} ). it is a colourless salt D. it is primary standard substance |
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| 364 | Which one of the following elements shows maximum number of different oxidation states in its compounds? A . Eu B . La ( c cdot ) Gd ( D cdot A m ) |
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| 365 | The atomic number of the element having magnetic moment equal to ( 1.7 mathrm{BM} ) in its +2 oxidation state is: A . 29 B. 25 ( c cdot 24 ) D. 30 |
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| 366 | Oxidation number of chromium in potassium dichromate is: ( A cdot+4 ) B. +5 ( c cdot+6 ) ( D cdot+3 ) |
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| 367 | Gadolinium belongs to ( 4 f ) series. It’s atomic number is ( 64 . ) Which of the following is the correct electronic configuration of gadolinium? ( mathbf{A} cdot[X e] 4 f^{7} 5 d^{1} 6 s^{2} ) B. ( [X e] 4 f^{6} 5 d^{2} 6 s^{2} ) ( mathbf{c} cdot[X e] 4 f^{8} 6 d^{2} ) D ( cdot[X e] 4 f^{9} 5 s^{1} ) |
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| 368 | form oxocations. A. Lanthanides B. Actinides c. Nobel gases D. Alkali metalss |
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| 369 | 28 Which of the following ions show higher spin only magnetic moment are 0.28 Which of value? (a) T²+ (c) Fe2+ (b) Mn2+ (d) Cos+ |
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| 370 | Which of the following is not an element of first transition series? ( A cdot F e ) B. co c. ( mathrm{Ni} ) D. Agg |
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| 371 | What is Misch metal? Give its composition and uses. |
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| 372 | In lanthanum, the differentiating electron enters into: ( mathbf{A} cdot d ) sub shel B. ( f ) sub shell c. ( s ) sub shell D. ( p ) sub shell |
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| 373 | An f-shell containing 6 unpaired electrons can exchange: A. 6 electrons B. 9 electrons c. 12 electrons D. 15 electrons |
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| 374 | What is the oxidation state of ( C r ) in ( left[boldsymbol{C r}left(boldsymbol{O}_{2}right)_{4}right]^{3-} ? ) ( A cdot+3 ) ( B cdot+4 ) ( c cdot+5 ) ( D cdot+6 ) |
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| 375 | Transition metals are good electrical conductor because A. they are metals B. they are solids C. they have free electrons in outer energy levels D. they are hard |
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| 376 | The electronic configuration of gadolinium (At. no.64) is: A ( cdot[X e] 4 f^{8}, 5 d^{0}, 6 s^{2} ) B . ( [X e] 4 f^{7}, 5 d^{1}, 6 s^{2} ) C . ( [X e] 4 f^{3}, 5 d^{5}, 6 s^{2} ) D . ( [X e] 4 f^{6}, 5 d^{2}, 6 s^{2} ) |
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| 377 | Generally transition elements for coloured salts due to the presence of unpaired electrons. Which of the following compound will be coloured in solid state? A. ( A g_{2} S O_{4} ) в. ( C u F_{2} ) c. ( C u_{2} C l_{2} ) D. ( Z n F_{2} ) |
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| 378 | The trivalent ion having largest size in Lanthanide series is: ( mathbf{A} cdot T i ) в. ( Z r ) c. ( H f ) D. La |
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| 379 | For the dichromate dianion, which of the following is true? 1) ( 4 C r-O ) bonds are equivalent 2) ( 6 C r-O ) bonds are equivalent |
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| 380 | Consider following statements. ( (I) ) The size of the lanthanide ions ( left(M^{3+}right) ) decreases as the atomic number of ( M ) increases. ( (I I) ) Electronic spectra of lanthanides show very broad bands. ( (I I I) ) As with transition metals, coordination number six is very common in lanthanide complexes. Which of the statements given above is/are correct? A. ( I ) only B. ( I ) and ( I I ) c. ( I ) and ( I I I ) D. III only |
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| 381 | Q. 43 Although +3 oxidation states is the characteristic oxidation state of lanthanoids but cerium shows +4 oxidation state also. Why? |
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| 382 | Spin only magnetic moment value of ( C r^{3+} ) ion is: A . 2.87 вм в. 3.87 вм ( mathrm{c} .3 .47 ) вм D. 3.67 ВМ |
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| 383 | Find the species/elemental atom that has a minimum number of unpaired electrons. ( A cdot K r^{+} ) B. ( M n^{2+} ) ( mathrm{c} cdot mathrm{Fe}^{3} ) D. ( O^{+} ) |
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| 384 | Aluminium appears like gold when mixed with : A. ( 90 % ) Cu B. 75 % Ni ( c cdot 80 % ) sn D. 80 % Co |
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| 385 | 0.33 Why Evalues for Mn, Ni and Zn are more negative than expected? 22. bet filled and completak |
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| 386 | Which of the following pairs has the same size? A. ( Z n^{2+}, H f^{4} ) B. ( F e^{2+}, N i^{4+} ) ( mathbf{c} cdot Z n^{4+}, T i^{4+} ) D. ( Z r^{4+}, H i^{4+} ) |
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| 387 | give any four characteristic properties of transition elements? | 12 |
| 388 | Most of the radio active elements are present in A. Lanthanoids B. Actinoids c. Representative elements D. Second transition series |
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| 389 | Cerium ( (z=58) ) is an important member of the lanthanides. Which of the following statements about cerium is incorrect? A. The common oxidation states of cerium are +3 and +4 B. The +3 oxidation state of cerium is more stable than the +4 oxidation state c. The +4 oxidation state of cerium is not known in solutions D. Cerium (IV) acts as an oxidising agent. |
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| 390 | Magnetic moment of ( boldsymbol{C r}(boldsymbol{Z}= ) ( mathbf{2 4}), boldsymbol{M n}^{+}(boldsymbol{Z}=mathbf{2 5}) ) and ( boldsymbol{F} boldsymbol{e}^{mathbf{2}+}(boldsymbol{Z}=mathbf{2 6}) ) are ( x, y, z . ) They are in order: A. ( x<y<z ) в. ( x=y<z ) c. ( z<x=y ) D. ( x=y=z ) |
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| 391 | On heating potassium permanganate, one of the following compound is not obtained. Identify the compound. ( A cdot O_{2} ) в. ( M n O ) c. ( M n O_{2} ) D. ( K_{2} M n O_{4} ) |
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| 392 | Which of the following is the most basic? ( mathbf{A} cdot C e(O H)_{3} ) в. ( L u(O H)_{3} ) ( mathbf{c} cdot Y b(O H)_{3} ) D. ( A l(O H)_{3} ) |
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| 393 | Is ( C r_{2} O_{3} ) an amphoteric oxide? If yes enter ( 1, ) else enter 0 |
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| 394 | ( C r^{2+} ) is unstable in water. | 12 |
| 395 | The stable oxidation state of ( boldsymbol{C} boldsymbol{e}(boldsymbol{Z}= ) ( mathbf{5 8} ) ) is: ( A cdot+4 ) ( B cdot+3 ) ( c cdot+2 ) ( D cdot+5 ) |
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| 396 | Write a chemical equation for burning of lanthanoids ( (text { ln }) ) in oxygen. |
12 |
| 397 | The trivalent ion having largest size is A. Ti B. zr ( c . ) нf D. La |
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| 398 | Which of the following compounds is not colored? A. ( N a_{2} C u C l_{4} ) в. ( N a_{2} C d C l_{4} ) ( mathbf{c} cdot N a_{3}left[F e(C N)_{6}right] ) D. ( K_{3}left[F e(C N)_{6}right] ) |
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| 399 | The complex ion which has no ( ^{prime} d^{prime} ) electrons in the central metal atom is: ( mathbf{A} cdotleft[M n O_{4}right]^{-} ) B ( cdotleft[operatorname{Co}left(N H_{3}right)_{6}right]^{3+} ) c. ( left[F e(C N)_{6}right]^{3-} ) D・ ( left[C rleft(H_{2} Oright)_{6}right]_{6}^{3+} ) |
12 |
| 400 | 29. Brass gets discoloured in air due to constant exposure in presence of: (1) Aluminium phosphide (2) Hydrogen sulphide (3) Hydrogenated wafers (4) Aluminium sulphide |
12 |
| 401 | Which element exhibits highest density in 3d series? A . Sc B. cr ( c cdot z n ) D. cu |
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| 402 | Identify the correct statement(s): This question has multiple correct options A. The oxidation number of ( C r ) in ( C r O_{5} ) is +6 B. ( Delta H>Delta U ) for the reaction ( N_{2} O_{4}(g) rightarrow 2 N O_{2}(g) ) provided both gases behave ideally. C ( . ) pH of ( 0.1 N H_{2} S O_{4} ) is less than that of ( 0.1 mathrm{N} mathrm{HCl} ) at ( 25^{circ} C ) D ( cdotleft(frac{R T}{F}right)=0.0591 ) volt at ( 25^{circ} mathrm{C} ) |
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| 403 | Which of the following statements concerning Lanthanide elements is false? A. All Lanthanides are highly dense metals B. Most characteristic oxidation state of Lanthanide elements is +3 C. The ionic radii of trivalent Lanthanides steadily increase with increase in the atomic number D. Lanthanoids are separated from one another by ion exchange methods |
12 |
| 404 | Which is the first energy level containing f-orbitals? | 12 |
| 405 | Which of the following is not an interstitial compound? A . ( T i C ) в. ( M o C ) ( mathrm{c} cdot F e_{0.82} mathrm{O} ) ( mathrm{D} cdot mathrm{Cr}_{2} mathrm{O}_{3} ) |
12 |
| 406 | 0.65 When When a chromite ore (A) is fused with sodium carbonate in free excess of air and the product is dissolved in water, a yellow solution of compound (B) is obtained. After treatment of this vellow solution with sulphuric acid, compound (C) can be crystallised from the solution. When compound (C) is treated with KCl, orange crystals of compound (D) crystallise out. Identify A to D and also explain the reactions. on in an oranda como |
12 |
| 407 | Give any two differences between lanthanoids and actinoids. |
12 |
| 408 | The maximum number of possible oxidation states of actinoides are shown by: A. Berkelium ( (B k) ) and califormium ( (C f) ) B. Nobelium (No) and lawrencium (Lr) c. Actinium ( (A c) ) and throium ( (T h) ) D. Neptunium (Np) and plutonium (Pu) |
12 |
| 409 | Why do transition elements form alloys? | 12 |
| 410 | Write down the reaction involved in preparation of Potassium dichromate from chromine ore. |
12 |
| 411 | 2.1 Electronic configuration of a transition element X in +3 oxidation state is [Ar]3d. What is its atomic number? (a) 25 (b) 26 (c) 27 (d) 240 |
12 |
| 412 | Assertion The catalytic converter in the car’s exhaust system converts polluting exhaust gases into non-toxic gases. Reason Catalytic converter contains a mixture of transition metals and their oxides embedded in the inner support. 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 |
12 |
| 413 | Choose the incorrect statement. A. Size of ( 4 d ) and ( 5 d ) series elements is almost same B. Generally, negative value of standard reduction potential ( left(M^{2+} / Mright) ) of ( 3 mathrm{d} ) -series element decreases across the period ( mathrm{C} cdot mathrm{Cr}_{2} mathrm{O}_{7}^{2-} ) has one type of ( mathrm{Cr}-mathrm{O} ) bond length D. Generally, actinide and lanthanide shows +3 oxidation state |
12 |
| 414 | Which of them is a mineral of lanthanum? A. Monazite B. Xenotime c. Euxenite D. All of the above |
12 |
| 415 | Because of lanthanoid contraction A. zrand Y have about the same radius B. zrand Nb have similar oxidation state c. zrand ( H f ) have about the same radius D. zrand zn have the same oxidation state |
12 |
| 416 | Increasing order of magnetic moment among the following species is: ( N a^{+}, F e^{+3}, C o^{+2}, C r^{+2} ) A. ( N a^{+}<C o^{2+}<C r^{2+}<F e^{3+} ) B. ( N a^{+}<F e^{3+}<C r^{2+}<C o^{2+} ) c. ( C r^{2+}<C o^{2+}<N a^{+}<F e^{3+} ) D. ( C o^{2+}<N a^{+}<C r^{2+}<F e^{3+} ) |
12 |
| 417 | State whether the given statement is true or false: Dipositive zinc exhibits paramagnetism due to loss of two electrons from ( 3 d ) -orbitals of neutral atom |
12 |
| 418 | Magnetic moment of ( S c^{2+}= ) Magnetic moment of ( boldsymbol{C} boldsymbol{u}^{2+} ) If true enter 1 , else enter 0 |
12 |
| 419 | Large quantity of ( K M n O_{4}, ) on treatment with cold conc. ( boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} ) forms a compound ( (X) ) which decomposed explosively, on heating forming ( (Y) ). The ( (X) ) and ( (Y) ) are respectively. ( mathbf{A} cdot M n_{2} O_{7}, M n O_{2} ) в. ( M n_{2} O_{7}, M n_{2} O_{3} ) c. ( M n S O_{4}, M n_{2} O_{3} ) D. ( M n_{2} O_{3}, M n O_{2} ) |
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| 420 | Which of the following ions has a magnetic moment of 5.93 BM? ( [A t . N o .: V=23, C r=24, M n=25, F e=26] ) ( mathbf{A} cdot M n^{2}+ ) B. ( F e^{2} ) ( c cdot C r^{2} ) ( D cdot V^{3} ) |
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| 421 | ( n s^{1} ) electronic configuration is not present in: ( A cdot A g ) в. мп ( c cdot c r ) D. cu |
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| 422 | 10 There are 14 elements in actinoid series. Which of the following elements does not belong to this series? (a) U (b) Np (c) Tm (d) Fm |
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| 423 | Knowing that the chemistry of lanthanoids ( (L n) ) is dominated by its +3 oxidation state, which of the following statements is incorrect? A. ( L n(I I I) ) hydroxides are mainly basic in character B. The ionic sizes of ( operatorname{Ln}(I I I) ) decrease in general with increasing atomic number c. Because of the large size of the ( L n(I I I) ) ions the bonding in its compounds is predominantly ionic in character D. ( L n(I I I) ) compounds are generally colourless |
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| 424 | A gas undergoes a thermodynamical process but the volume of the gas does not change. What is the nature of this process? A. Isothermal B. Adiabatic c. Isobaric D. Isochoric |
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| 425 | The magnetic moment of an ion in its +3 oxidation state is 3.85 BM. The number of unpaired electrons present in the ion is A B. 4 ( c cdot 3 ) D. 5 |
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| 426 | Of the following outer electronic configurations of atoms, the highest oxidation state is achieved by which one of them? A ( cdot(n-1) d^{8} n s^{2} ) B . ( (n-1) d^{5} n s^{1} ) c. ( (n-1) d^{3} n s^{2} ) D. ( (n-1) d^{5} n s^{2} ) |
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| 427 | Select the correct options: A. Due to lanthanide contraction ( Z r ) and ( H f ) have almost equal size. B. ( d ) – and ( f ) -orbitals do not shield the nuclear charge very effectively c. Both (A) ( &(mathrm{B}) ) are correct statements. D. Both (A) & (B) are incorrect statements. |
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| 428 | Which of the following statements are incorrect? A. ( N b ) is stable in +4 oxidation state B. ( B k ) in +4 oxidation state is strongly oxidising but more stable than ( C m ) and ( A m ) in +4 oxidation state C. Uranium can form oxygenated ion such as ( U O_{2}^{2+} ) D. ( P u ) shows oxidation state up to +7 |
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| 429 | Question 12. What are the interstitial compounds? Why are such compounds well known for transition metals |
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| 430 | Arrange the following in increasing value of magnetic moments. (i) ( left[boldsymbol{F e}(boldsymbol{C N})_{mathbf{6}}right]^{4-} ) (ii) ( left.boldsymbol{F e}(boldsymbol{C N})_{6}right]^{3-} ) (iii) ( boldsymbol{C r}left(boldsymbol{N} boldsymbol{H}_{3}right)_{6}^{3+} ) ( left.(text { iv }) N ileft(H_{2} Oright)^{4}right]^{2+} ) A ( cdot(I)<(I I)<(I I I)<(I V) ) в. ( (I)<(I I)<(I V)<(I I I) ) c. ( (I I)<(I I I)<(I)<(I V) ) D. ( (I V)<(I I I)<(I I)<(I) ) |
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| 431 | Give reason: (a) Cerium(Ce) exhibits +4 oxidation state. (b) Actinoid contraction is greater from element to element than lanthanoid contraction. |
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| 432 | The lanthanide contraction is responsible for the fact that A. zn and Y have about the same radii B. zrand Nb have similar oxidation state c. zrand Hf have about the same radii D. zrand zn have the same oxidation state |
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| 433 | The point of dissimilarity between lanthanides and actinides is: A. three outermost shells are partially filled B. they show oxidation of ( +3( ) common) c. they are called inner transition elements D. they are radioactive in nature |
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| 434 | 0.56 Match the solutions given in Column I and the colours given in Column II. Column 1 Column II (Aqueous solution of salt) (Colour) FeSO7H, Green NICI, 4H, O Light pink MnCl, 41,0 Blue COCI, 6H, 4. Pale green CuCl₂ Pink Colourless |
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| 435 | Q. 40 Although Cr3+ and Co2+ ions have same number of but the magnetic moment of Cr3+ is 3.87 BM and that of Cost is 4.87 BM, Why? Ans Magnetic moment of a the bonic of snin as well as orbital |
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| 436 | A member of Lanthanide is: This question has multiple correct options A. Cesium B. Lanthanum C. Neoybium D. Luticium |
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| 437 | Which of the following reactions are disproportionation reactions? (।) ( C u^{+} rightarrow C u^{2+}+C u ) (II) ( 3 M n O_{4}^{-}+4 H^{+} rightarrow 2 M n O_{4}^{-}+ ) ( M n O_{2}+2 H_{2} O ) (III) ( 2 K M n O_{4} rightarrow K_{2} M n O_{4}+ ) ( M n O_{2}+O_{2} ) ( (mathrm{IV}) 2 M n O_{4}^{-}+3 M n^{2+}+2 H_{2} O rightarrow ) ( mathbf{5} M n O_{2}+4 H^{+} ) ( A cdot(1),(1) ) B. (I), (II), (III) ( c cdot(11),(11),(1 v) ) ( D .(1),(1 v) ) |
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| 438 | ( M n O_{2}+K O H+O_{2} stackrel{Delta}{rightarrow} ) ( mathbf{2 K}_{mathbf{2}} boldsymbol{M} boldsymbol{n} boldsymbol{O}_{4}+mathbf{4} boldsymbol{H}_{2} boldsymbol{O} ) pot manganate If true enter 1 else 0 ( mathbf{A} cdot mathbf{1} ) |
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| 439 | Which of the following compounds will not give ( +v e ) chromyl chloride test? A. ( C u C l_{2} ) в. ( H g C l_{2} ) c. ( Z n C l_{2} ) D. ( C_{6} H_{5} N H_{2} H C l ) |
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| 440 | Lanthanoid contraction is caused due to: A. imperfect shielding of outer electrons by ( 4 f ) – electrons from the nuclear charge. B. appreciable shielding on outer electrons by ( 4 f ) electrons from the nuclear charge. C . appreciable shielding on outer electrons by ( 5 d ) electrons from nuclear charge. D. the same effective nuclear charge from Ce to Lu. |
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| 441 | Choose the correct answer from the alternative given Amongst ( T i F_{6}^{2-}, C o F, C u_{2} C l_{2} ) and NiCl, which are the colourless species? (atomic number of ( mathrm{Ti}=22, mathrm{Co}= ) ( 27, C u=29, N i=28) ) A ( cdot C o F_{6}^{3-} ) and ( N i C l_{4}^{2} ) B . ( T i F_{6}^{2-} ) and ( C u_{2} C l_{2} ) c. ( C u_{2} C l_{2} ) and ( N i C l_{4}^{2} ) D. ( T i F_{6}^{2-} ) and ( C o F_{6}^{3-} ) |
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| 442 | Order of magnitude of density of Uranium nucleous is: ( left[boldsymbol{m}_{boldsymbol{p}}=mathbf{1 . 6 7} timesright. ) ( left.mathbf{1 0}^{-mathbf{2 7}} mathbf{k g}right] ) A ( cdot 10^{20} mathrm{kgm}^{3} ) В . ( 10^{17} mathrm{kgm}^{3} ) ( mathbf{c} cdot 10^{14} mathrm{kgm}^{3} ) D. ( 10^{11} mathrm{kgm}^{3} ) |
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| 443 | Which of the following Lanthanoid is radioactive? A. Cerium B. Promethium c. Thulium D. Lutetium |
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| 444 | Explain why: Transition elements form coloured compounds. |
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| 445 | The d-electron configurations of ( boldsymbol{C r}^{2+}, boldsymbol{M n}^{2+}, boldsymbol{F} boldsymbol{e}^{2+} ) and ( boldsymbol{C o}^{2+} ) are ( d^{4}, d^{5}, d^{6} ) and ( d^{7} ) respectively. Which one of the following will exhibit minimum paramagnetic behaviour? (Atomic numbers of ( mathrm{Cr}=mathbf{2 4}, boldsymbol{M n}= ) ( mathbf{2 5}, mathbf{F e}=mathbf{2 6}, mathbf{C o}=mathbf{2 7}) ) ( mathbf{A} cdotleft[M nleft(H_{2} Oright)_{6}right]^{2+} ) в. ( left[mathrm{Fe}left(mathrm{H}_{2} mathrm{O}right)_{6}right]^{2} ) c. ( left[operatorname{Co}left(H_{2} Oright)_{6}right]^{2+} ) D ( cdotleft[C rleft(H_{2} Oright)_{6}right]^{2} ) |
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| 446 | Q. 62 Assertion (A) Cu cannot liberate hydrogen from acids. Reason (R) Because it has positive electrode potential. |
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| 447 | 25 Which of the following actinoids show oxidation states upto +7? (a) Am . (b) Pu (c) U (d) Np |
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| 448 | Transition metals show paramagnetism due to A. Characteristic configuration B. high lattice energy c. variable oxidation states D. unpaired electrons |
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| 449 | Which one of the transition metal ions have no unpaired electrons? ( mathbf{A} cdot mathbf{T}_{mathbf{i}^{+}} ) B. ( v^{+4} ) ( c cdot v^{+3} ) ( D cdot c r^{3} ) |
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| 450 | I.P values of post lanthanides ( (boldsymbol{A} boldsymbol{g}, boldsymbol{A} boldsymbol{u}) ) have higher values down the group. Explain. |
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| 451 | Limestone is present in the blast furnace in production of iron in order to ( (I) ) provide a source of ( C a O ) ( (I I) ) remove some impurities ( (boldsymbol{I I I}) ) supply ( boldsymbol{C O}_{2} ) A. ( I, I I, I I I ) в. ( I, I I ) c. ( I I, I I I ) D. I only |
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| 452 | What is the action of acidified potassium dichromate on the following: 1. ( boldsymbol{H}_{2} boldsymbol{S} ) |
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| 453 | Copper (II) sulfate solution is: A . red B. purple c. orange D. green E. blue |
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| 454 | Which of the following pair has the same size? ( mathbf{A} cdot mathrm{Fe}^{2+}, mathrm{Ni}^{2+} ) B. ( z r^{4+}, ) Ti ( ^{4+} ) ( mathbf{c} cdot z r^{4+}, H f^{4+} ) ( mathbf{D} cdot mathbf{z} mathbf{n}^{2+}, mathbf{H} mathbf{f}^{4} ) |
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| 455 | Which of the following is a Lanthanoid? A. Ta B. Rh ( c . ) Th D. Lu |
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| 456 | Question 29. The chemistry of the actinoid elements is not so smooth as that of the lanthanoids. Justify this statement by giving some examples from the oxidation state of these elements. |
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| 457 | ( N i^{2+} ) ion ( (Z=28) ) contains unpaired electrons ( A ) B. 2 ( c cdot 3 ) D. 5 |
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| 458 | The oxidation state of Fe in browns ring complex ( left[mathrm{Fe}left(mathrm{H}_{2} mathrm{O}right)_{5} mathrm{NO}^{+}right] mathrm{SO}_{4} ) is: ( A cdot+1 ) ( B cdot+2 ) ( c cdot+3 ) ( D cdot+4 ) |
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| 459 | Assertion Equivalent mass of ( K M n O_{4} ) is equal to one-third of its molecular mass when it acts as an oxidising agent in an alkaline medium. Reason Oxidation number of ( M n ) is +7 in ( boldsymbol{K} boldsymbol{M} boldsymbol{n} boldsymbol{O}_{4} ) 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 | ( boldsymbol{C r}_{2} boldsymbol{O}_{mathbf{7}}^{2-} stackrel{boldsymbol{p H}=boldsymbol{x}}{boldsymbol{longrightarrow} boldsymbol{r} boldsymbol{O}_{4}^{2-} stackrel{boldsymbol{p H}=boldsymbol{y}}{boldsymbol{U}} boldsymbol{C}_{mathbf{2}} boldsymbol{O}_{boldsymbol{7}}^{2-}} ) pH values ( x ) and ( y ) can be: A. 4 and 5 B. 4 and 8 ( c cdot 8 ) and 4 D. 8 and 9 |
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| 461 | Which of these can absorb visible light ( ? ) A ( cdotleft[operatorname{Sc}left(H_{2} Oright)_{6}right] C l_{3} ) В ( cdotleft[T i(e n)_{3}right]left(S o_{4}right)_{2} ) ( mathbf{c} cdotleft[Z nleft(N H_{3}right)_{6}right] S O_{4} ) D ( cdotleft[operatorname{Cr}left(N H_{3}right)_{6}right] C l_{3} ) |
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| 462 | Which of the following lanthanide ion is paramagnetic? A ( cdot C e^{4} ) в. ( Y b^{2} ) ( c cdot L u^{3} ) D. ( E u^{2} ) |
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| 463 | Which of the following complex ions, which is diamagnetic in nature? A ( cdotleft[C c F_{6}right]^{3-} ) B. ( left[N i C l_{4}right]^{2-} ) c. ( left[N i(C N)_{4}right]^{2} ) ( mathbf{D} cdotleft[C u C l_{2}right]^{2} ) |
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| 464 | Assertion The degree of complex formation in actinides decreases in the order ( boldsymbol{M}^{mathbf{4}+}>boldsymbol{M} boldsymbol{O}_{mathbf{2}}^{mathbf{2}+}>boldsymbol{M}^{mathbf{3}+}>boldsymbol{M} boldsymbol{O}_{mathbf{2}}^{+} ) Reason Actinides form complexes with ( pi ) bonding ligands such as alkyl phosphines and thioethers. 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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| 465 | Europium is A. s-block element B. p-block element c. d-block element D. f-block element |
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| 466 | How many unpaired electrons are there in the electronic structure for ( C u^{+} ) ion? ( mathbf{A} cdot mathbf{1} ) B. 3 ( c .5 ) D. none of these |
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| 467 | Which of the following species have same magnetic moment? This question has multiple correct options A ( cdot C r^{+} ) B. ( F e^{+3} ) c. ( C o^{+2} ) D. ( N i^{+2} ) |
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| 468 | Why ( S c^{3+} ) salts are colorless whereas ( C r^{3+} ) salt are coloured? |
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| 469 | How will you pure potassium permanganate crystals from its ore, pyrolusite? Give the reaction involve |
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| 470 | The first ionisation potential of ( boldsymbol{N}, boldsymbol{P}, boldsymbol{O} ) and ( S ) are in the order of ( mathbf{A} cdot S>PN ) В . ( N>O>P>S ) c. ( N>O S ) |
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| 471 | The first IE of lithium is ( 5.4 mathrm{eV} ) and first electron affinity of ( C l ) is ( 3.6 mathrm{eV} ). The value ( Delta boldsymbol{H} ) for the reaction ( boldsymbol{L} boldsymbol{i}_{(boldsymbol{g})}+boldsymbol{C l}(boldsymbol{g}) rightarrow ) ( boldsymbol{L} boldsymbol{i}_{boldsymbol{g})}^{+}+boldsymbol{C l}_{(boldsymbol{g})}^{-}, ) is ( (text {in } mathrm{eV}) ) A . +1.8 в. +2.8 c. -2.8 ( D ldots+9 ) |
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| 472 | An element M has the electron configuration ( [A r] 3 d^{5} 4 s^{2} . ) So, which of the following oxide cannot exist for element M? A. ( M O_{2} ) B. ( M_{2} O_{3} ) c. ( M O_{4} ) D. ( M_{2} O_{7} ) |
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| 473 | The incorrect statement for d-block element is: A. it shows magnetic property B. it has variable valency c. it has tendency to form coloured ions D. it has complete d-orbitals |
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| 474 | Which of the following properties are common to the elements manganese, iron, cobalt, nickel and copper? (I) Coloured ions in aqueous solution (II) Oxides of nitrogen on reaction with concentrated ( boldsymbol{H} boldsymbol{N} boldsymbol{O}_{3} ) (III) Chlorides of formula ( M C l_{2} ) and ( M C l_{3} ) A. ।, ॥।, ॥। B . ।, ॥ c. ॥, ॥ा D. I only |
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| 475 | 4 040 Q. 6 The magnetic nature of elements depends on the presence of unpaired electrons. Identify the configuration of transition element, which shows highest magnetic moment. (2) 3d (6) 305 (d) 3d2 (c) 3d8 |
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| 476 | Write the consequences of lanthanide contraction? |
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| 477 | Which of the following electronic configuration shows transition metal? A ( cdot 1 s^{2} 2 s^{2} 2 p^{6} dots . . n s^{2} n p^{2} ) B ( cdot 1 s^{2} 2 s^{2} 2 p^{6} ldots . . n s^{2} n p^{2} n d^{3}(n+1) s^{2} ) C ( cdot 1 s^{2} 2 s^{2} 2 p^{6} ldots . . n s^{2} n p^{6} ) D. ( 1 s^{2} 2 s^{2} 2 p^{6} ldots . . n s^{2} n p^{1} ) |
12 |
| 478 | What is meant by ferrimagnetism? Give any two examples. | 12 |
| 479 | Which of the following is ferromagnetic. A. Cu, Ag, Au B. Fe, Co, Ni c. ( z n, ) Сd, ( mathrm{Hg} ) D. ( mathrm{Ca}, mathrm{Sr}, mathrm{Ba} ) |
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| 480 | Which of the following statements is not correct? This question has multiple correct options ( mathbf{A} cdot L u(O H)_{3} ) is less basic than ( L a(O H)_{3} ) B. In lanthanide series, ionic radius of ( L a^{3+}-L n^{3+} ) ion increases C. La is actually an element of transition series rather lanthanide D. Atomic radius of Zr and Hf are same because of lanthanide contraction |
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| 481 | Which of the following reagents are used as primary standard? ( boldsymbol{I}: boldsymbol{K} boldsymbol{M} boldsymbol{n} boldsymbol{O}_{4} ; boldsymbol{I} boldsymbol{I}: boldsymbol{N} boldsymbol{a} boldsymbol{O} boldsymbol{H} ; boldsymbol{I} boldsymbol{I} boldsymbol{I} ) ( boldsymbol{K}_{2} boldsymbol{C r}_{2} boldsymbol{O}_{7} ) ( boldsymbol{I} boldsymbol{V}: boldsymbol{F} boldsymbol{e} boldsymbol{S} boldsymbol{O}_{4}left(boldsymbol{N} boldsymbol{H}_{4}right)_{2} boldsymbol{S} boldsymbol{O}_{4} cdot boldsymbol{6} boldsymbol{H}_{2} boldsymbol{O} ; boldsymbol{V} ) ( boldsymbol{H}_{2} boldsymbol{C}_{2} boldsymbol{O}_{4} cdot boldsymbol{2} boldsymbol{H}_{2} boldsymbol{O} ) A. All except II, ( I V ) B. All except I, II C. All except ( I ), II, III D. only ( I V ) |
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| 482 | The magnetic moment of an ion is close to ( 36 times 10^{-24} ) Joule /Tesla. The number of unpaired electrons of the ion are ( A cdot 4 ) B. 2 ( c cdot 1 ) D. 3 |
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| 483 | Which of the following shows highest magnetic moment? A ( cdot C o^{+3} ) B. ( C r^{+} ) ( mathbf{c} cdot F e^{+3} ) D. ( N i^{+2} ) |
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| 484 | ( T i^{3+} ) is more easily reduced than ( C o^{3+} ) If true enter 1 , else enter 0 . |
12 |
| 485 | 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 |
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| 486 | The outer electronic configuration of two members of lanthanoids series are as follows ( 4 f^{1} 5 d^{1} 6 s^{2} ) and ( 4 f^{7} 5 d^{0} 6 s^{2} ) what are their atomic numbers? Predict heir oxidation states. |
12 |
| 487 | Which of the following compounds has a melting point of ( 606^{circ} mathrm{C} ) ? A. cupric iodide B. cuprous iodide c. ferric iodide D. ferrous iodide |
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| 488 | The lanthanide contraction is responsible for the fact that: A. zrand Hf have same radius B. Zrand Zn have the same oxidation state c. zrand Y have same radius D. zrand Nb have similar oxidation state |
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| 489 | Which of the following ions have zero value of magnetic moment? A ( cdot S c^{3} ) в. ( T i^{4} ) ( c cdot Z n^{2} ) D. None of these |
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| 490 | Choose the correct answer from the alternative given. Complete the following reactions. |
12 |
| 491 | The colour of ( M n O_{4}^{-} ) ion is due to: A. unpaired d-electrons B. ( d ) -d transition c. d-p transition D. charge transfer |
12 |
| 492 | Select correct statement(s). A. Across a transition series, 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) & (b) are correct statements D. None of the above statement is correct. |
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| 493 | Which of the following statements is/are correct, when a mixture of ( N a C l ) and ( K_{2} C r_{2} O_{7} ) is gently warmed with concentrated ( boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} ? ) This question has multiple correct options A. Deep red vapors are evolved B. The vapors when passed into ( N a O H ) solution give a yellow solution of ( N a_{2} C r O_{4} ) c. chlorine gas is evolved. D. Chromyl chloride is formed. |
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| 494 | When ( I^{-} ) is oxidized by ( M n O_{4}^{-} ) in alkaline medium, ( I^{-} ) is converted into ( A cdot I O_{3}^{-} ) в. ( I_{2} ) ( mathbf{c} cdot I O_{4}^{-3} ) D. IO |
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| 495 | When ( H_{2} O_{2} ) is added to an acidified solution of ( K_{2} C r_{2} O_{7}, ) the solution: A. turns green due to the formation of ( C r_{2} O_{3} ) B. turns yellow due to the formation of ( K_{2} C r O_{4} ) c. turns deep blue-violet due to the formation of ( operatorname{Cr} Oleft(O_{2}right)_{2} ) D. gives green precipitate due to the formation of ( C r(O H)_{3} ) |
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| 496 | What is/are true statement? This question has multiple correct options A. lons of ( d ) -block elements are colored due to ( d-d ) transition B. Ions of ( f ) -block elements are colored due to ( f-f ) transtition ( ^{mathbf{C}} cdotleft[operatorname{Sc}left(H_{2} Oright)_{6}right]^{3+},left[T ileft(H_{2} Oright)_{6}right]^{4+} ) are colored complexes. D. ( C u^{+} ) is colorless ion. |
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| 497 | Te 3 Q. 24 In the form of dichromate, Cr(VI) is a strong oxidis medium but MO(VI) in Moo, and W(VI) in WO, are not because (a) Cr (VI) is more stable than Mo(VI) and W(VI). (b) Mo (VI) and W (VI) are more stable than Cr(VI). (C) Higher oxidation states of heavier members of group-6 of transition series are more stable. (d) Lower oxidation states of heavier members of group-6 of transition series are more stable. |
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| 498 | What would happen when a solution of potassium chromate is treated with an excess of dilute nitric acid? A ( cdot C r^{3+} ) and ( C r_{2} O_{7}^{2-} ) are formed B. ( C r_{2} O_{7}^{2-} ) and ( H_{2} O ) are formed C. ( C r_{2} O_{4}^{2-} ) is reduced to +3 state of ( c r ) D. ( C r_{2} O_{4}^{2-} ) oxidised to +7 state of ( c r ) |
12 |
| 499 | Give any two difference between lanthanoids and actinoids. |
12 |
| 500 | Give reasons: Silver articles becomes black after exposure to air. |
12 |
| 501 | Which of the following belongs to the actinide series of elements? A . B. Ta c. D. Lu |
12 |
| 502 | Among the following, the couple with most positive reduction potential is : A. ( M n^{+3} / M n^{+2} ) B. ( C r^{+3} / C r^{+2} ) c. ( F e^{+3} / F e^{+2} ) D. ( C o^{+3} / C o^{+2} ) |
12 |
| 503 | What is the correct order of covalent size of the following? Ca A. ( C a=S c ) в. ( C a D. Noneofthese |
12 |
| 504 | ( mu=sqrt{15} ) is true for the pair: A ( cdot C o^{2+}, C r^{3+} ) B. ( F e^{+2}, C r^{+3} ) ( mathbf{c} cdot F e^{+3}, F e^{+2} ) D. ( M n^{+2}, F e^{+2} ) |
12 |
| 505 | Write name and symbol of one transuranic element. | 12 |
| 506 | Q. 4 Generally, transition elements form coloured salts a unpaired electrons. Which of the following compounds solid state? (a) Ag2SO4 (b) CuF, (c) ZnF2 (d) CuCl2 ements form coloured salts due to the presence of hich of the following compounds will be coloured in |
12 |
| 507 | Select correct statement for the lesser number of oxidations states in ( 3 d- ) series. A. In the beginning of the series it can be due to the presence of too few electrons to loose or share. B. Towards the end of the series, it can be ascribed to the presence of too many electrons and thus fewer empty orbitals to share electrons with the ligands. ( mathrm{c} . ) Both ( (mathrm{A}) ) and ( (mathrm{B}) ) are correct D. None of the above is correct |
12 |
| 508 | The ratio of magnetic moments of Fe(III) and Co(III) is: A. ( sqrt{5}: sqrt{7} ) B. ( sqrt{35}: sqrt{24} ) c. 7: 3 D. ( sqrt{24}: sqrt{15} ) |
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| 509 | If ( M ) is the element of the actinoid series, the degree of complex formation decrease in the order: A ( cdot M^{4+}>M^{3+}>M O_{2}^{2+}>M O_{2}^{+} ) B . ( M O_{2}^{+}>M O_{2}^{2+}>M^{3+}>M^{4} ) c. ( M^{4+}>M O_{2}^{2+}>M^{3+}>M O_{2}^{text {th }} ) D. ( M O_{2}^{2+}<M O_{2}^{+}M^{3+} ) |
12 |
| 510 | Which of the following are all radio active elements? A. Transition elements B. P block elements c. Lathanides D. Actinides |
12 |
| 511 | Q.47 Match species given in Column I with the electronic configuration given in Column II. Column Column II A. Cr 1. [Ar]3d® 45° B. Fe2+ 2. [Ar]3d’° 45′ C. Ni²+ 3. [Ar]3d 45° D. Cu 4. [Ar]3d45 5. [Ar]3d 452 |
12 |
| 512 | Oxidation number of cobalt in ( Kleft[C o(C O)_{4}right] ) is: ( A cdot+1 ) ( B cdot+3 ) ( c cdot-1 ) ( D cdot-3 ) |
12 |
| 513 | Q. 34 Why first ionisation enthalpy of Cr is lower than that of Zn? 5 |
12 |
| 514 | Match List I and List II. List I A. Americium 1. Lanthanide B. Lanthanum 2. Transition metal C. Promethium 3. Actinide D. Technician 4. Synthetic element 5. Radioactive element B. ( A-3,5 ; B-4 ; C-5 ; D-2 ) c. ( A-5 ; B-1,3 ; C-2,3 ; D-4 ) D. A – 2,5; B – 2; C – 1,5; D – – |
12 |
| 515 | Write the name of two metals which are used in maximum composition in mischmetal? |
12 |
| 516 | If each one of the above ionic species is in turn kept in a magnetic field, which one will get attracted? A ( cdot C_{0}^{+2} ) B. ( M n^{+7} ) ( c cdot S c^{+3} ) D. ( T i^{+} ) |
12 |
| 517 | Question 24. A violet compound of manganese (A) decomposes on heating to liberate oxygen and compounds (B) and (C) of manganese are formed. Compound (C) reacts with KOH in the presence of potassium nitrate to give compound (B). On heating compound (C) with cone. H,SO, and NaCl, chlorine gas is liberated and a compound (D) of manganese along with other products is formed. Identify compounds A to D and also explain the reactions involved. |
12 |
| 518 | The property seen in ( f ) -block elements is : A. Lanthanoid contraction B. Actinide contraction ( c cdot operatorname{both}(A) ) and ( (B) ) D. Lanthanoid expansion |
12 |
| 519 | Electron transfer from ( F eleft(H_{2} Oright)_{6}^{2+} ) to ( F eleft(H_{2} Oright)_{6}^{3+} ) is likely to occur via: A. ( d-d ) transition B. inner sphere electron transfer c. ( S_{N} 1 ) mechanism D. outer sphere electron transfer |
12 |
| 520 | 12 Which of the following is amphoteric oxide? MnO,, CrO3, Cr,O3, Cro, V,05, V,04 (a) V,05,Cr, Oz (b) Mn 07, CrO; (c) Cro, V,05 (d) V2O5, V,04 |
12 |
| 521 | Assertion ( C e^{4+} ) is good analytical reagent. Reason ( C e^{4+} ) has the tendency to change to ( C e^{3+} ) 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 |
12 |
| 522 | One among the lanthanoids, ( boldsymbol{C} boldsymbol{e}(boldsymbol{I} boldsymbol{I} boldsymbol{I}) ) can be easily oxidised to ( C e(I V) ) Explain |
12 |
| 523 | Which is called chromic acid? A. ( C r O ) в. ( C r_{2} O_{3} ) ( mathrm{c} cdot mathrm{CrO}_{3} ) D. ( C r O_{2} ) |
12 |
| 524 | 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{f} s^{2} ) D. ( 3 d^{6} 4 s^{2} ) |
12 |
| 525 | 11 KMno, acts as an oxidising agent in acidic medium. The number of moles of KMnO4 that will be needed to react with one mole of sulphide ions in acidic solution is (a) (b) d) UTIN Uw UT IN |
12 |
| 526 | The magnetic moment order is correctly given in: ( mathbf{A} cdot F e^{2+}<F e^{3+}<M n^{4+}<C r^{3+} ) B ( cdot C r^{3+}=M n^{4+}<F e^{2+}<F e^{3+} ) ( mathbf{c} cdot C r^{3+}=M n^{4+}<F e^{3+}<F e^{2+} ) D ( cdot F e^{2+}<C r^{3+}<F e^{3+}<M n^{4+} ) |
12 |
| 527 | Identify the pairs of ions possessing eq ual spin only magnetic moments: A. ( C o^{-2}, N i^{+2} ) B. ( C o^{+2}, C r^{+3} ) c. ( F e^{+2}, F e^{+3} ) D. ( F e^{+2}, C r^{+3} ) |
12 |
| 528 | ( C l_{2} ) gas is obtained by various reaction select the reactions from the following(s): This question has multiple correct options A. ( K M n O_{4}+ ) conc.HCl ( triangleq ) B . ( K C l+K_{2} C r_{2} O_{7}+ ) conc.H ( _{2} S O_{4} stackrel{Delta}{longrightarrow} ) c. ( M n O_{2}+ ) conc.HCl ( Delta ) D. ( K C l+F e_{2}left(S O_{4}right)_{3} rightarrow ) |
12 |
| 529 | Which of the following is not physically change? Magnetizing of a piece of iron. |
12 |
| 530 | Question 9. In what way is the electronic configuration of the transition elements different from that of non-transition elements? Solution Transition olomonta |
12 |
| 531 | ( M n O_{4}^{2-} ) changes to ( M n O_{2} ) into ( M n O_{4}^{-} ) in acidic medium. Calculate equivalent weight of ( M n O_{4}^{2-} ) ( mathbf{A} cdot 1 M ) B. ( frac{1}{2} M ) ( c cdot frac{3}{2} M ) D. ( 3 M ) |
12 |
| 532 | The transition metals (with the exception of ( mathrm{Zn}, mathrm{Cd} ) and ( mathrm{Hg} ) ) are hard and have high melting and boiling points. If true enter 1 else 0 |
12 |
| 533 | Match the following catalyst with their products ( -B ;(i i)-A ;(i i i)-D ;(i v)-C ) ( mathbf{A} cdot(i) ) B ( cdot(i)-C ;(i i)-D ;(i i i)-B ;(i v)-A ) ( mathbf{c} cdot(i)-D ;(i i)-A ;(i i i)-B ;(i v)-C ) D. ( (i)-A ;(i i)-B ;(i i i)-C ;(i v)-D ) |
12 |
| 534 | In the ground state of ( C u^{+}, ) the number of shells occupied, sub-shells occupied, filled orbitals and unpaired electrons respectively are: [Atomic no. of copper ( =29 ) A .4,8,15,0 В. 3,6,15,1 c. 3,6,14,0 D. 4,7,14,2 |
12 |
| 535 | Question 7. Which is the stronger reducing agent Cr2+ or Fe2+ and why? Consider Eº values and reducing agent is stronger if it gets oxidised easily. |
12 |
| 536 | When ( K M n O_{4} ) acts as an oxidising agent and ultimately forms ( left[M n O_{4}right]^{2-} ) ( M n O_{2}, M n_{2} O_{3}, M n^{2+}, ) then the number of electrons transferred in each case respectively is: A .4,3,1,5 B. 1, 5, 3, 7 ( c cdot 1,3,4,5 ) D. 3, 5, 7, |
12 |
| 537 | ( C r^{2+} ) is reducing in nature while the same ( d- ) orbital configuration ( left(d^{4}right) M n^{+3} ) is an oxidising agent |
12 |
| 538 | The value of magnetic moment of ( boldsymbol{V}^{3+}(boldsymbol{Z}=mathbf{2 3}) ) is: A ( sqrt{2} B M ) T в. ( sqrt{3} B M ) ( mathbf{c} cdot 2 B M ) D. ( sqrt{8} B M ) |
12 |
| 539 | Catalytic activity of transition metals depends on: A. their ability to exist in different oxidation states B. the size of the metal atoms c. the number of empty atomic orbitals available D. none of these |
12 |
| 540 | How does gold react with aquaregia? | 12 |
| 541 | 0.32 Why does copper not replace hydrogen from acids? | 12 |
| 542 | Which of them is a property of lanthanides?
This question has multiple correct options |
12 |
| 543 | Question 4. The E°(M2+/M) value for copper is positive (+0.34 V). What is possibly the reason for this? FE 13 |
12 |
| 544 | ( K M n O_{4} ) on treatment with conc. ( boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} ) forms a compound ( (X) ) which decomposes explosively on heating forming (Y). The (X) and (Y) are respectively: A. ( M n_{2} O_{7}, M n O_{2} ) В. ( M n_{2} O, M n_{2} O_{3} ) c. ( M n S O_{4}, M n_{2} O_{3} ) D. ( M n_{2} O_{3}, M n O_{2} ) |
12 |
| 545 | Question 1. Write down the electronic configuration of (i) Cr3+ (ii) Pm3+ (iii) Cu (iv) Ce+ (v) Co2+ (vi) Lu2+ (vii) Mn2+ (viii) Th4+ Recall the atomic number of each element and write their electronic configuration then, remove the electrons from the outer most shell according to positive charge present on the ion. |
12 |
| 546 | Which of the following ion will give colourless aqueous solution? A ( . N i^{2} ) B. ( S c^{3} ) ( c cdot C u^{2} ) D. ( M n^{3+} ) |
12 |
| 547 | Lanthanide ions show A. magnetic properties B. coloured ion formation c. lanthanide D. All of the above |
12 |
| 548 | . 61 Assertion (A) Actinoids form relatively less stable complexes as compared to lanthanoids. Reason (R) Actinoids can utilise their 5f orbitals alongwith 6d orbitals in bonding but lanthanoids do not use their 4f orbital for bonding. |
12 |
| 549 | German silver alloy contains: A. Zinc, silver and copper B. Nickel, silver and copper C. Germanium, silver and copper D. Zinc, nickel and copper |
12 |
| 550 | The position in the periodic table to which the ( A l ) metal belongs: A. Alkali metals B. Alkaline earth metals c. ( d ) – block elements D. ( p ) -block elements |
12 |
| 551 | Give the electron configuration of the given metal (atom/ions) ( boldsymbol{C r}^{mathbf{3}+} ) ( mathbf{A} cdot[A r] 3 d^{1} 4 s^{2} ) B ( cdot[A r] 3 d^{2} 4 s^{1} ) c. ( [A r] 3 d^{3} ) D. none of these |
12 |
| 552 | Which of the following is paramagnetic? A ( cdot V(C O)_{6} ) в. ( F e(C O)_{5} ) c. ( F e_{2}(C O)_{9} ) D. ( operatorname{Cr}(text {CO})_{6} ) |
12 |
| 553 | The outer electronic configuration of transitional elements is: A ( cdot(n-1) s^{2} n d^{1-2} ) B ( cdot(n+1) s^{2} n d^{1-5} ) C ( cdot(n-1) s^{2} n p^{6}(n-1) d^{1-10} n s^{1,2} ) D ( cdot n s^{2}(n-1) d^{1-10} ) |
12 |
| 554 | Which of the following is a Lanthanide element? A . Ac B. Al c. Nd D. Pd |
12 |
| 555 | Question 1. Silver atom has completely filled d-orbitals (4219) in it ground state. How can you say that it is a transition element? Transition elements have incomplete d-orbital in its any oxidation state +2 state of Ag atom has incomplete 4d-orbital. pridation state exhibit |
12 |
| 556 | Order of paramagnetic character among following elements is/are: This question has multiple correct options ( mathbf{A} cdot M n>F e>C r ) в. ( F e>Z n>C r ) c. ( C r>F e>Z n ) ( mathrm{D} cdot mathrm{Cr}>mathrm{Mn}>mathrm{Fe} ) |
12 |
| 557 | A transition element ( X ) has a configuration ( [A r] 3 d^{4} ) in its +3 oxidation state. Its atomic number is not: This question has multiple correct options A . 25 B . 26 c. 22 D. 19 |
12 |
| 558 | Question 20. On the basis of lanthanoid contraction, explain the followin Nature of boncitability of oxasanthanoids. (1) Nature of bonding in La203 and Lu203. (ii) Trends in the stability of oxosalts of lanthanoids from La to Lu. (iii) Stability of the complexes of lanthanoids. (iv) Radii of 4d and 5d-block elements. (v) Trends in acidic character of lanthanoid oxides. |
12 |
| 559 | Which one of the lanthanoids is radioactive in nature? A . cs B. Np ( c cdot c e ) D. Pm |
12 |
| 560 | Write any four applications of ( ^{prime} f^{prime}- ) block elements. |
12 |
| 561 | R. 58 Match the properties given in Column 1 with the metals given in Column II. Column! Column (Property) Weta A Element with highest second lorisation enthalpy Element with highest third lonisation enthalpy C Min M(CO), is D. Element with highest heat of atomisation 5. N |
12 |
| 562 | The atomic numbers of elements of second inner transition elements lie in the range of : ( A cdot 88 ) to 101 B. 89 to 102 ( c cdot 90 ) to 103 D. 91 to 104 |
12 |
| 563 | How will you obtain pure potassium permanganate ( left(boldsymbol{K} boldsymbol{M} boldsymbol{n} boldsymbol{O}_{4}right) ) crystals from its ore, pyrolusite? Give the steps involved and the reactions. |
12 |
| 564 | Which of them is a characteristic of lanthanides? This question has multiple correct options A. Dissolve in hot water B. React with acids c. React with other non-metals D. Are non-metals |
12 |
| 565 | Write two similarities between chemistry of lanthanoids and actinoids. |
12 |
| 566 | Which is more stable in the below given pair? ( M n_{2} O_{7}_{-}-_{-}–R e_{2} O_{7} ) A ( cdot M n_{2} O_{7}=R e_{2} O_{7} ) в. ( M n_{2} O_{7}R e_{2} O_{7} ) D. None of these |
12 |
| 567 | The stoichiometric coefficient of manganese dioxide in the balanced chemical reaction when potassium permanganate is added to a hot solution of manganous sulphate is |
12 |
| 568 | 0.35 Transition elements show high melting points. Why? nition elements show high |
12 |
| 569 | Assertion ( Y b^{+2} ) is more stable in compare to ( G d^{+2} ) Reason The electron configuration of ( G d ) is ( [boldsymbol{X} boldsymbol{e}] boldsymbol{4} boldsymbol{f}^{7} boldsymbol{5} boldsymbol{d}^{2} boldsymbol{6} boldsymbol{s}^{2} ) 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 |
12 |
| 570 | The oxidation state of copper changes when aqueous copper (II) ions react with: ( (I) N a O H(a q) ) ( (I I) F e(s) ) ( (I I I) K I(a q) ) A. ( I, I I, I I I ) B. II only c. ( I I, I I I ) D. I only |
12 |
| 571 | The first and last elements of actinides are: A. Actinium and Thorium B. Actinium and Nobelium c. Actinium and Mendelevium D. Actinium and Lawrencium |
12 |
| 572 | The composition of turbid suspension (B) and the white precipitate (C) are respectively. A ( cdot operatorname{Sn} C l_{2}, operatorname{Sn}(O H)_{2} ) в. ( operatorname{Sn}(O H) C l, quad N a_{2} Z n O_{2} ) c. ( operatorname{Sn}(O H) C l, operatorname{Sn}(O H)_{2} ) D. ( operatorname{Sn}(O H) C l, ) SnCl ( _{4} ) |
12 |
| 573 | Statement 1: Transition metal compounds are often colored. Statement 2: They frequently possess partially filled d-orbitals. A. Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement1 B. Both the Statement 1 and Statement 2 are correct, but 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 |
12 |
| 574 | ( K M n O_{4} ) can be prepared from ( K_{2} M n O_{4} ) as per the reaction: ( mathbf{3} M n O_{4}^{2-}+2 H_{2} O rightleftharpoons 2 M n O_{4}^{-}+ ) ( M n O_{2}+4 O H^{-} ) The reaction can go to completion by removing ( boldsymbol{O H}^{-} ) ions by adding: A. ( H C l ) в. КОН ( mathrm{c} cdot mathrm{CO}_{2} ) D. ( S O_{2} ) |
12 |
| 575 | Statements that are true of d-and ( f- ) block elements are: 1. The colour of ( K_{2} C r_{2} O_{7} ) is due to d-d transition. 2. Actinides have larger number of oxidation states than lanthanides. 3. Tripositive ions of ( operatorname{Pr}(text { At. } N o .=59) ) and ( T m(A t . N o .=69) ) have the same (green) colour. 4. Actinides have paramagnetic moments less than theoretically predicted values. A. 2,3,4 B. 1,2,3 ( c cdot 2,4 ) D. 1,2,4 |
12 |
| 576 | Which of the following compound is expected to be coloured? A. ( A g_{2} S O_{4} ) в. ( C u F_{2} ) c. ( M g F_{2} ) D. cucl |
12 |
| 577 | The fusion of chromite ore ( left(F e C r_{2} O_{4}right) ) with ( N a_{2} C O_{3} ) in air gives a yellow solution upon addition of water. Subsequent treatment with ( boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} ) produces an orange solution. The yellow and orange colours, respectively, are due to the formation of: A. ( N a_{2} C r O_{4} ) and ( N a_{2} C r_{2} O_{7} ) в. ( operatorname{Cr}(O H)_{3} ) and ( N a_{2} C r_{2} O_{7} ) c. ( C r_{2}left(C O_{3}right)_{3} ) and ( F e_{2}left(S O_{4}right)_{3} ) D. ( operatorname{Cr}(O H)_{3} ) and ( N a_{2} C r O_{4} ) |
12 |
| 578 | Transition metals are less reactive than alkali metals because they have: A. high ionisation potential and low melting point B. high ionisation potential and high melting point c. low ionisation potential and low melting point D. low ionisation potential and high melting point |
12 |
| 579 | A transition element ( X ) has a configuration ( [A r] 3 d^{4}, ) in its +3 oxidation state. Its atomic number is: A . 25 B. 26 c. 22 D. 19 |
12 |
| 580 | Write the uses of Lanthanides. | 12 |
| 581 | The atomic radii of cerium and promethium are quite similar because A. they belong to the same period in periodic table B. they have similar electronic configuration C. f-orbitals have poor shielding effect D. nuclear charge is higher on cerium than promethium |
12 |
| 582 | The general electronic configuration of d-block element is ( (n-1) d^{1-10} n s^{1-2} ) where ( n ) is the outer most shell. However, palladium does not follow this general electronic configuration. It has an electron configuration ( [boldsymbol{K} boldsymbol{r}]^{36} boldsymbol{4} boldsymbol{d}^{10} boldsymbol{5} boldsymbol{s}^{0} ) |
12 |
| 583 | The numbers of d-electrons retained in ( F e^{2+}(text { atomic number } F e=26) ) ion is: ( A cdot 3 ) B. 4 ( c .5 ) D. 6 |
12 |
| 584 | (a) Account for the following: (i) ( C u^{+} ) is unstable in an aqueous solution. (ii) Transition metals form complex compounds. (b) Complete the following equations: ( boldsymbol{C r}_{2} boldsymbol{O}_{7}^{2-}+boldsymbol{8} boldsymbol{H}^{+}+boldsymbol{3} boldsymbol{N} boldsymbol{O}_{overline{2}} rightarrow ) |
12 |
| 585 | Assertion The purple colour of ( K M n O_{4} ) is due to the charge transfer transition. Reason The intense colour in most of the transition metal complexes is due to ( boldsymbol{d}-boldsymbol{d} ) transition. 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 |
12 |
| 586 | A larger number of oxidation states are exhibited by the actinides than those by the lanthanides. The main reason being: A. more reactive nature of the actinides than the lanthanides B. ( 4 f ) orbitals are more diffused than the ( 5 f ) orbital c. lesser energy difference between ( 5 f ) and ( 6 d ) orbitals than between ( 4 f ) and ( 5 d ) orbital D. more energy difference between ( 5 f ) and ( 6 d ) orbitals than between ( 4 f ) and ( 5 d ) orbitals |
12 |
| 587 | Copper forms two chlorides ( C u C l ) and ( boldsymbol{C u} boldsymbol{C l}_{2} ) (a) Identify the copper ions in these compounds? (b) What is the valency of copper in each of these compounds? (c) By writing the sub-shell electronic configuration of copper, find out a subshells from which the electrons are lost to form these ions. (d) Write the period and group to which copper belongs. (Hint: Atomic number of copper ( =mathbf{2 9} ) ) |
12 |
| 588 | Highest oxidation State of manganese in fluorides is ( +4left(M n F_{4}right) ) but highest oxidation state in oxides is ( +7left(M n_{2} O_{7}right) ) because: A. fluorine is more electronegative than oxygen B. fluorine does not possess d-orbitals c. fluorine stabilises lower oxidation state D. in covalent compounds, fluorine can form single bond only while oxygen forms double bond |
12 |
| 589 | Addition of non-metals like ( B ) and ( C ) to the interstitial sites of a transition metal results the metal: This question has multiple correct options A. of more ductability B. of less ductability c. Less malleable D. of more hardness |
12 |
| 590 | Why do transition elements show variable oxidation state?
Explain their catalytic properties in details. |
12 |
| 591 | The main reason for larger number of oxidation state exhibited by the actinides than that corresponding lanthanide, is: A. lesser energy difference between ( 5 f ) and ( 6 d ) orbital than between ( 4 f ) and ( 5 d ) -orbital B. larger atomic size of actinides than the lanthanides C. more energy differenc between 5f and 6d orbitals than between 4f and 5d-orbitals D. greater reactive nature of the actinides than the lanthanides |
12 |
| 592 | Knowing that the chemistry of lanthanids ( (mathrm{Ln}) ) is dominated by its +3 oxidation state, which of the following statements are correct? (1) The ionic sized of ( L n(| I) ) decreases in general with increasing atomic number. (II) ( mathrm{Ln}(mathrm{III}) ) compounds are generally colourless. (III) ( operatorname{Ln}(| I) ) hydroxides are mainly basic in character (IV) Because of the large size of the Ln (III) ions, the bonding in its compounds is predominently ionic in character. A. I, III and III B. II, III and IV c. ।, ॥ and IV D. I, III and IV |
12 |
| 593 | Which of the following has the maximum number of unpaired delectrons? A ( cdot F e^{2} ) в. ( C u^{+} ) ( c cdot Z n ) D. ( N i^{3} ) |
12 |
| 594 | Which of the following can be oxidised by acidified ( boldsymbol{K}_{2} boldsymbol{C r}_{2} boldsymbol{O}_{7} ? ) A. Nitrate ions B. Sulphite ions c. Ferric ions D. Borate ions |
12 |
| 595 | Maximum oxidation state of uranium and plutonium are respectively: A. 4 and 6 B. 5 and 6 ( c .6 ) and 7 D. 6 and 8 |
12 |
| 596 | Which metal is used to make alloy steel for armour plates, safes and helmets? ( A cdot A ) в. мп c. ( mathrm{cr} ) D. Pb |
12 |
| 597 | What is oxidation number of ( C r ) in ( C r O_{5} ) or ( C r Oleft(O_{2}right)_{2} ? ) |
12 |
| 598 | General electronic configuration of lanthanides are: ( mathbf{A} cdot(n-2) f^{1-14}(n-1) s^{2} p^{6} d^{0-1} n s^{2} ) B ( cdot(n-2) f^{10-14}(n-1) d^{0-1} n s^{2} ) C ( cdot(n-2) f^{0-14}(n-1) d^{10} n s^{2} ) D. ( (n-2) f^{0-1}(n-1) f^{1-14} n s^{2} ) |
12 |
| 599 | Q. 31 Although +3 is the characteristic oxidation state for lanthanoids but cerium also shows +4 oxidation state because (a) it has variable ionisation enthalpy (b) it has a tendency to attain noble gas configuration (c) it has a tendency to attain fº configuration (d) it resembles Pb4+ |
12 |
| 600 | Give balanced equations for the following reactions? Acidifed potassium permanganate and oxalic acid. |
12 |
| 601 | The white anhydrous copper sulphate is heated to high temperature, it gives: A ( cdot C u S O_{4} cdot 5 H_{2} O ) в. ( C u S O_{4} . H_{2} O ) c. ( C u S O_{4}+S O_{3} ) D. ( C u O ) |
12 |
| 602 | Consider the following statements and arrange in the order of true/false as given in the codes. ( mathrm{S}_{1}: mathrm{Mn}^{2+} ) compounds more stable than ( mathrm{Fe}^{2+} ) towards oxidation to their +3 states. ( mathrm{S}_{2}: ) Titanium and copper both in the first series of transition metals exhibits +1 oxidation state most frequently. ( mathbf{S}_{3}: mathbf{C u}^{+} ) ion is stable in aqueous Solution A. TTF B. T F F ( mathbf{c} . ) T ( F T ) D. F FT |
12 |
| 603 | Select the correct statement(s). This question has multiple correct options A. Transition metals and many of their compounds show paramagnetic behaviour. B. The enthalpies of atomisation of the transition metals are low. C. The transition metals generally form coloured compounds. D. Transition metals and their many compounds act as good catalyst. |
12 |
| 604 | Consider the following list of reagents: Acidified ( boldsymbol{K}_{2} boldsymbol{C r}_{2} boldsymbol{O}_{7}, ) alkaline ( boldsymbol{K} boldsymbol{M} boldsymbol{n} boldsymbol{O}_{4}, boldsymbol{C u} boldsymbol{S} boldsymbol{O}_{4}, boldsymbol{H}_{2} boldsymbol{O}_{2}, boldsymbol{C l}_{2}, boldsymbol{O}_{2}, boldsymbol{F e C l} ) and ( N a_{2} S_{2} O_{3} . ) The total number of reagents that can oxidise aqueous iodide to iodine is: |
12 |
| 605 | Actiniod contraction is more than lanthanold contraction because: A. energy of 4 f and 5f orbitals are same B. 5 forbitals are more diffused as compared to 4 f orbitals c. actinoids show greater range of oxidation states than lanthanoids D. actinoids are highly reactive |
12 |
| 606 | The correct order of ionic radii of ( mathrm{Ce}, mathrm{La} ) Pm, and Yb in +3 oxidation state is: ( mathbf{A} cdot L a^{3+}<P m^{3+}<C e^{3+}<Y b^{3+} ) B ( cdot Y b^{3+}<P m^{3+}<C e^{3+}<L a^{3+} ) ( mathbf{c} cdot L a^{3+}<C e^{3+}<P m^{3+}<Y b^{3+} ) D. ( Y b^{3+}<C e^{3+}<P m^{3+}<L a^{3+} ) |
12 |
| 607 | Statements that are true of transition and inner transition metals are : This question has multiple correct options A. osmium is the heaviest transition metal B. ( C u^{+}left(3 d^{10}right) ) is more stable than ( C u^{2+}left(3 d^{9}right) ) in aqueous medium C . actinides are generally strong reducing agents D. ( Y, L a ) and ( A c ) exhibit variable valency |
12 |
| 608 | In neutral or faintly alkaline medium, thiosulphate is quantitatively oxidized by ( K M n O_{4} ) to: ( mathbf{A} cdot S O_{3}^{2-} ) B. ( S O_{4}^{2-} ) ( c cdot s O_{2} ) D. ( S O_{5}^{2-} ) |
12 |
| 609 | Which lanthanide compound is used as a pigment? A. ( C e O_{2} ) B. ( operatorname{Ce}(O H) ) c. ( L u(O H)_{3} $ ) D. ( operatorname{Tb}(O H)_{3} ) |
12 |
| 610 | Use hund’s rule to derive the electronic configuration of ( C e^{+3} ) ion, and calculate its magnetic moment on the basis of ‘spin only’ formula. ( For ( mathrm{Ce}, mathrm{Z}=58 ) ) |
12 |
| 611 | Discuss the consequences of lanthanide contraction. |
12 |
| 612 | Fit 0.47 The second and third rows of transition elements resemble each other much more than they resemble the first row. Explain, why? |
12 |
| 613 | Arrange the following ions in order of increasing strength as a reducing agent, and account for the trend: A ( cdot C r^{2+}<C r_{2} O_{7}^{2-}<C r^{3+} ) B. ( C r^{2+}<C r^{3+}<C r_{2} O_{7}^{2} ) c. ( C r_{2} O_{7}^{2-}<C r^{3+}<C r^{2} ) D. ( C r_{2} O_{7}^{2-}<C r^{2+}<C r^{3+} ) |
12 |
| 614 | Oxidation state of Iron in Hemoglobin is: ( A cdot+2 ) ( B cdot+4 ) ( c cdot+6 ) D. |
12 |
| 615 | The separation of Lanthanoids by ion exchange method is based on A. basicity of the hydroxides B. size of the ions c. the solubility of their nitrates D. oxidation state of the ion |
12 |
| 616 | Which of following is not correctly matched? A. d-block element: electronic configuration is ( n s^{0-2}(n-1) d^{1-1} ) B. p-block element : electronic configuration is ( n s^{2} n p^{1-6} ) C. s-block element: electronic configuration is ( n s^{1-2} ) D. None of these |
12 |
| 617 | Which of the following compounds is not coloured? A ( cdot N a_{2}left[C u C l_{4}right] ) B . ( N a_{2}left[C d C l_{2}right] ) ( mathbf{c} cdotleft[operatorname{Cr}left(H_{2} Oright)_{6}right] C l_{3} ) D. all of the above |
12 |
| 618 | Highly volatile metal is: ( A cdot v ) B. cr ( c . ) мn D. zn |
12 |
| 619 | Lanthanoids are A. 14 elements in the sixth period(atomic number ( =90 ) to 103) that are filling 4f-sublevel B. 14 elements in the seventh period(atomic number ( =90 ) to 103 ) that are filling ( 5 f ) -sublevel C. 14 elements in the sixth period(atomic number ( =58 ) to 71) that are filling ( 4 f ) -sublevel D. 14 elements in the seventh period(atomic number ( =58 ) to 71 ) that are filling ( 4 f ) -sublevel |
12 |
| 620 | NCERT LI Q. 13 Gadolinium belongs to 4f series. Its atomic following is the correct electronic configuration (a) [Xej4f75d’6s? (c) [Xe]4fºod? Ane Cal Godolipili number 64 The correct electronic Senes. Its atomic number is 64. Which of… ectronic configuration of gadolinium? (b) [Xe]4f65d26s? (d) [Xe]4fºss’ |
12 |
| 621 | Because of lanthanoid contraction, which of the following pairs of elements have nearly the same atomic radii? A. ( z r(40) ) and ( H f(72) ) B. ( operatorname{Zr}(40) ) and ( operatorname{Ta}(73) ) c. ( operatorname{Ti}(22) ) and ( z r(40) ) D. ( z r(40) ) and ( N b(41) ) |
12 |
| 622 | A transition element containing only one electron in ( 4 s ) -orbital is: A ( cdot_{21} mathrm{Se} ) В. ( _{23} M n ) ( mathbf{c} cdot_{26} F e ) D・ ( _{29} C u ) |
12 |
| 623 | Assertion Copper dissolves in dilute nitric acid but not in dilute ( boldsymbol{H} boldsymbol{C l} ) Reason Copper has positive ( boldsymbol{E}^{circ} ) |
12 |
| 624 | Q.51 Reactivity of transition elements decreases almost regularly Cu. Explain. enthalpies As we |
12 |
| 625 | ( A n^{3+} ) (trivalent actinoid ions) have configuration A ( .5 f^{0} ) to ( 5 f^{14} ) B. ( 5 f^{1} ) to ( 5 f^{14} ) ( mathbf{c} cdot 5 f^{2} ) to ( 5 f^{1} ) D. ( 5 f^{0} ) to ( 5 f^{13} ) |
12 |
| 626 | 46 A solution of KMnO4 on reduction yields either a colourless solution or a brown precipitate or a green solution depending on pH of the solution. What different stages of the reduction do these represent and how are they carried out? |
12 |
| 627 | The highest magnetic moment is shown by the transition metal ion with outer electronic configuration: A ( cdot d^{9} ) B . ( d^{7} ) ( c cdot d^{5} ) ( mathbf{D} cdot d^{3} ) |
12 |
| 628 | us fe of Cu is +0.34V while that of Zn is–0.76 V. Explain. | 12 |
| 629 | The titanium (atomic number ( =22 ) ) compound that does not exist is : A . ( T i O ) в. ( T i O_{2} ) ( mathrm{c} . K_{2} T i O_{4} ) D. ( K_{2} T i F_{6} ) |
12 |
| 630 | The highest oxidation state shown by transition element is : This question has multiple correct options ( A cdot+7 ) by ( mathrm{Mn} ) B. +8 by Os ( mathbf{c} cdot+8 ) by Ru D. +7 by ( mathrm{Fe} ) |
12 |
| 631 | Select a ferromagnetic material from the following? A. Dioxygen B. Chromium (IV) oxide c. Benzene D. Dihydrogen monoxide |
12 |
| 632 | Red lead is: ( mathbf{A} cdot P b O ) ( mathbf{B} cdot P b O_{2} ) ( mathbf{C} cdot P b_{3} O_{4} ) ( mathbf{D} cdot P b_{2} O_{4} ) |
12 |
| 633 | What happens when sulphur dioxide gas is passed through an aqueous solution of a Fe(III) salt? | 12 |
| 634 | .69 Mention the type of compounds formed when small atoms like H, C and N get trapped inside the crystal lattice of transition metals. Also give physical and chemical characteristics of these compounds. Ali |
12 |
| 635 | Chemically Zinc group elements closely resemble A. I A group B. II A group c. III A group D. IV A group |
12 |
| 636 | Assertion ( boldsymbol{K}_{2} boldsymbol{C r}_{2} boldsymbol{O}_{7} ) is generally preferred over ( N a_{2} C r_{2} O_{7} ) in volumetric analysis although both are oxidizing agents. Reason ( N a_{2} C r_{2} O_{7} ) is deliquescent in nature. 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 |
12 |
| 637 | Assertion Transition metals are good catalysts. Reason Transition metals have variable oxidation state. 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 |
12 |
| 638 | Select the incorrect reaction from the following. ( mathbf{A} cdot 2 N a_{2} C r O_{4}+H^{+} rightarrow N a_{2} C r_{2} O_{7}+2 N a^{+}+H_{2} O ) B. ( 4 M n O_{2}+4 K O H+O_{2} rightarrow 4 K M n O_{4}+2 H_{2} O ) ( mathbf{c} cdot 2 M n O_{4}^{-}+5 C_{2} O_{4}^{2}+16 H^{+} rightarrow 2 M n^{2+}+10 C O_{2}+8 H_{2} O ) D. ( M n O_{4}^{-}+8 H^{+}+5 F e^{2+} rightarrow 5 F e^{3+}+M n^{2+}+4 H_{2} O ) |
12 |
| 639 | Transition metals are good catalytic agent. Why? |
12 |
| 640 | Which one of the following ions has electronic configuration ( [mathrm{Ar}] 3 mathrm{d}^{6} ? ) ( A cdot N i^{3} ) B. ( mathrm{Mn}^{3+} ) ( mathbf{c} cdot mathrm{Fe}^{3} ) ( D cdot c_{0}^{3} ) |
12 |
| 641 | ( C r O_{2}^{2+} ) is the cation from: A. ( C r O ) в. ( C r_{2} O_{3} ) c. ( C r O_{5} ) D. ( operatorname{Cr} mathrm{O}_{3} ) |
12 |
| 642 | Potassium permanganate is: A. purple solution B. brown-orange liquid C. green gas D. silver-gray liquid E . yellow-orange when burned in a flame |
12 |
| 643 | When ( M n O_{2} ) is fused with ( mathrm{KOH} ) and ( K C l O_{3}, ) a coloured compound is formed, the product and its colour is: A ( cdot K_{2} M n O_{4}, ) green B . ( K M n O_{4} ), purple c. ( M n_{2} O_{3} ), brown D. ( M n_{3} O_{4} ), black |
12 |
| 644 | The calculated spin-only magnetic moments (BM) of the anionic and cationic species of ( left[boldsymbol{F} eleft(boldsymbol{H}_{2} boldsymbol{O}right)_{6}right]_{2} ) and ( left[boldsymbol{F e}(boldsymbol{C} boldsymbol{N})_{mathbf{6}}right], ) respectively, are: A .4 .9 and 0 B. 2.84 and 5.92 c. 0 and 4.9 D. 0 and 5.92 |
12 |
| 645 | Q. 41 Ionisation enthalpies of Ce, Pr and Nd are higher than Th, Pa and U. Why? Ane ce Prand Ald |
12 |
| 646 | IL PONDID Question 31. Use Hund’s rule to derive the electronic configuration of Cet ion, and calculate its magnetic moment on the basis of ‘spin only formula. (1) Write the configuration of Ce and Ce 3+. (ii) Find the number of unpaired electrons and calculateu. 12 |
12 |
| 647 | The element with atomic number 111 might belong to which of the following group? A. Chromium B. Scandium c. copper D. Titanium |
12 |
| 648 | Variable valency in general is shown by : A. gaseous elements B. non-metals c. s-block elements D. d-block elements |
12 |
| 649 | Question 10. Although Zr belongs to 4d and Hf belongs to 5d transition series but it is quite difficult to separate them. Why? . |
12 |
| 650 | General electron configuration of d-block elements is: ( mathbf{A} cdot n s^{2} n p^{6} n d^{1-10} ) B ( cdot(n-1) d^{1-10} n s^{0-2} n p^{0-6} ) ( mathbf{c} cdot(n-1) d^{1-10} n s^{1-2} ) ( mathbf{D} cdot n d^{1-9} n s^{0-2} ) |
12 |
| 651 | The reactivity of ( mathrm{Cu}, mathrm{Ag} ) and ( mathrm{Au} ) decreases in the order: A. ( C u>A g>A u ) в. ( A u>A g>C u ) c. ( A g>A u>C u ) D. ( A g>C u>A u ) |
12 |
| 652 | Among the following pairs of ions, the lower oxidation state in aqueous solution is more stable than the other in A ( cdot T i^{+}, T i^{3+} ) в. ( C u^{+}, C u^{2+} ) c. ( C r^{2+}, C r^{3+} ) D. ( V^{2+}, V O^{2+} ) |
12 |
| 653 | Which of the two have almost similar size? В. ( _{41} N b ) and ( _{73} T a ) ( mathbf{c} cdot_{39} Y ) and ( _{57} L a ) D. ( _{20} C a ) and ( _{31} I r ) |
12 |
| 654 | Consider the following statements with respect to lanthanides: 1. The basic strength of hydroxides of lanthanides increases from ( boldsymbol{L} boldsymbol{a}(boldsymbol{O} boldsymbol{H})_{3} ) to ( boldsymbol{L} boldsymbol{u}(boldsymbol{O} boldsymbol{H})_{3} ) 2. The lanthanide ions ( L u^{3+}, Y b^{2+} ) and ( C e^{4+} ) are diamagnetic. Which of the statement(s) given above is/are correct? A. 1 only B. 2 only c. Both 1 and 2 D. Neither 1 nor 2 |
12 |
| 655 | Select the coloured and paramagnetic ions. A ( cdot C u^{+}, Z n^{2+}, C a^{2+} ) B ( cdot S c^{3+}, T i^{4+}, V^{5+} ) c. ( C u^{2+}, C r^{+}, M n^{2+} ) D. ( N i^{2+}, C u^{+}, H g^{2+} ) |
12 |
| 656 | Thermal decomposition of a ( M n ) compound ( (X) ) at ( 513 K ) results in compound ( Y, M n O_{2} ) and a gaseous product. ( M n O_{2} ) reacts with ( N a C l ) and concentrated ( H_{2} S O_{4} ) to give a pungent ( operatorname{gas} Z ) ( X, Y ) and ( Z, ) respectively. ( mathbf{A} cdot K_{2} M n O_{4}, K M n O_{4} ) and ( S O_{2} ) B . ( K_{2} M n O_{4}, K M n O_{4} ) and ( C l_{2} ) c. ( K_{3} M n O_{4}, K_{2} M n O_{4} ) and ( C l_{2} ) D. ( K M n O_{4}, K_{2} M n O_{4} ) and ( C l_{2} ) |
12 |
| 657 | Fill in the blank: Inner transition elements exhibit different coloured compounds on account of unfilled orbitals. ( A ) B. f ( c cdot d ) ( D ) |
12 |
| 658 | The electronic configuration of gadolinium is: ( mathbf{A} cdot[X e] 4 f^{3} 5 d^{5} 6 s^{2} ) ( mathbf{B} cdot[X e] 4 f^{6} 5 d^{2} 6 s^{2} ) ( mathbf{c} cdot[X e] 4 f^{8} 5 d^{9} 6 s^{2} ) ( mathbf{D} cdot[X e] 4 f^{7} 5 d^{1} 6 s^{2} ) |
12 |
| 659 | Which of them can be used as a catalyst? A. Neodymium phosphide B. Cerium phosphate c. Praseodymium oxide D. Neodymium(III) nitrate |
12 |
| 660 | Which of the following is diamagnetic ion? A ( . Z n^{2} ) the ( ^{2} n^{n^{n}} ) B. ( N i^{2} ) ( c cdot C o^{2} ) D. ( C u^{2} ) |
12 |
| 661 | The chemistry of the actinoids is not so smooth as that of the lanthanoids. Justify this statement by giving some examples from the oxidation state of these elements. |
12 |
| 662 | Pyrolusite is ( M n O_{2} ) used to prepare ( K M n O_{4} . ) Steps are: ( M n O_{2} stackrel{I}{longrightarrow} M n O_{2}^{2-} stackrel{I I}{longrightarrow} M n O_{4}^{-} ) Steps ( I ) and ( I I ) are respectively: This question has multiple correct options A. fuse with ( K O H / ) air, electrolyte oxidation B. fuse with ( K O H / K N O_{3} ), electrolyte oxidation. c. fuse with concentrated ( H N O_{3} ) /air, electrolytic reduction D. dissolve in ( H_{2} O ) oxidation |
12 |
| 663 | The only element that exhibits positive SRP value is A. B. zn c. ( mathrm{Fe} ) D. cu |
12 |
| 664 | What is “Tailing of Mercury” | 12 |
| 665 | What is the oxidation state of coloured ion in ( left[boldsymbol{C u}left(boldsymbol{N} boldsymbol{H}_{3}right)_{4}right]^{2+} ? ) |
12 |
| 666 | Q. 42 Match the following species with their corresponding ground state electronic configuration. Atom/lon Electronic configuration A. CU 1. 1s 2s 2p 3s 3p%3d0 B. Cu²+ 2. 1s 2s 2p 3s 3p 3d 104s? C. Zn²+ 3. 1s 2s 2p 3s 3p%3d1045 4. 1s 2s 2p 3s 3p 3d 5. 1s 2s 2p 3s 3p®3d3 D. Cr3+ |
12 |
| 667 | Fe is made passive by: A ( cdot ) dil. ( H_{2} S O_{4} ) B. dil. НСl c. conc. ( H N O_{3} ) D. conc. ( H_{2} ) SO ( _{4} ) |
12 |
| 668 | The atomic number of an element ( ^{prime} M^{prime} ) is ( 26 . ) How many electrons are present in the M-shell of the element in its ( M^{3+} ) state? A . 11 B . 15 c. 14 D. 13 |
12 |
| 669 | Question 13. How is the variability in oxidation states of transition metals different from that of non-transition metals? Illustrate with examples. |
12 |
| 670 | The family of elements which consists of atoms that have valence electrons in a ( d ) subshell is: A. alkali metals B. alkaline earth metals c. noble gases D. halogens E. transition metals |
12 |
| 671 | Ona Ouestion 18. When a chromite ore (A) is fused with sodium carbon. in free excess of air and the product is dissolved in water, a yello solution of compound (B) is obtained. After treatment of this yello solution with sulphuric acid, compound (C) can be crystallised from the solution. When compound (C) is treated with KCl, orange crystals of compound (D) crystallise out. Identify A to D and also explain the reactions. |
12 |
| 672 | Titanium oxide is added in interior paints for walls of rooms, halls and galleries to give: ( A ). a whiter ‘white’ B. a greener’green’ c. a redder’red D. silver-white |
12 |
| 673 | The general configuration ( (n-1) d^{3} n s^{2} ) indicates that the particular element belongs to ( _{-}- ) – – ( – ) group. A . II B B. IB c. ( vee ) в D. III B |
12 |
| 674 | Answer the following:What is lanthanoid contraction? Mention one of its consequences. |
12 |
| 675 | The lanthanoid ion which contains unpaired electrons is: A ( cdot C e^{4} ) в. ( Y b^{2} ) c. ( L u^{3} ) D. ( E u^{2} ) |
12 |
| 676 | 0.64 Identify A to E and also explain the reaction involved. OUCO, CUO heat with us (D) I Ca(OH), HNO, (conc.) (Milky) CO2 NH, (aq) Ca(HCO3)2 Clear solution Blue solution |
12 |
| 677 | Balanced reaction ( : 2 mathrm{MnO}_{4}^{-}+mathrm{I}^{-}+mathrm{H}_{2} mathrm{O} ) ( rightarrow 2 mathrm{MnO}_{2}+2 mathrm{OH}^{-}+mathrm{IO}_{3}^{-1} ) If true enter 1 else 0 ( A ) |
12 |
| 678 | A reduction in atomic size with increase in atomic number is a characteristic of elements of: A. d-block B. f-block c. radioactive series D. high atomic masses |
12 |
| 679 | ( K M n O_{4} ) solution is: A . red B. purple c. orange D. green E. blue |
12 |
| 680 | Which of the following lanthanoid ions is diamagnetic ? (At. No. ( C e= ) ( mathbf{5 8}, boldsymbol{S m}=mathbf{6 2}, boldsymbol{E u}=mathbf{6 3}, boldsymbol{Y b}=mathbf{7 0}) ) A ( cdot C e^{2} ) B . ( S m^{2+} ) c. ( E u^{2+} ) D. ( Y b^{2} ) |
12 |
| 681 | Following are the transition metal ions of ( 3 d ) series: ( boldsymbol{T} boldsymbol{i}^{4+}, boldsymbol{V}^{2+}, boldsymbol{M} boldsymbol{n}^{3+}, boldsymbol{C} boldsymbol{r}^{3+} ) (Atomic numbers: ( boldsymbol{T} boldsymbol{i}=mathbf{2 2}, boldsymbol{V}= ) ( mathbf{2 3}, boldsymbol{M n}=mathbf{2 5}, boldsymbol{C r}=mathbf{2 4}) ) Answer the following: (i) Which ion is most stable in an aqueous solution and why? (ii) Which ion is a strong oxidising agent and why? (iii) Which ion is colourless and why? |
12 |
| 682 | The silver salts like ( A g B r ) and ( A g I ) are coloured because of: A. d-d transition of electrons B. charge transfer C. polirisation of halid ( A g^{+} ) by D. both (b) and (c) |
12 |
| 683 | When acidified ( K_{2} C r_{2} O_{7} ) solution is added to ( S n^{2+} ) salts, then ( S n^{2+} ) changes to: ( A cdot S n ) в. ( S n^{3} ) ( c cdot s n^{4} ) D. ( S n^{+} ) |
12 |
| 684 | The number of occupied subshell in ( C r^{3+} ) ions is: ( A cdot 3 ) B. 4 ( c cdot 5 ) D. 6 |
12 |
| 685 | Lanthanides and actinides are recognised as? A. s- block element B. d-block element c. f-block element D. p-block element |
12 |
| 686 | Which of the following reactions is not correct? ( mathbf{A} cdot M n O_{4}^{-}+8 H^{+}+5 F e^{2+} rightarrow 5 F e^{3+}+M n^{2+}+4 H_{2} O ) B ( cdot 2 M n O_{2}+4 K O H+O_{2} rightarrow 4 K M n O_{4}+2 H_{2} O ) ( mathbf{c} cdot 2 N a_{2} C r O_{4}+2 H^{+} rightarrow N a_{2} C r_{2} O_{7}+2 N a^{+}+H_{2} O ) D. ( K_{2} C r_{2} O_{7}+7 H_{2} S O_{4}+6 K I rightarrow 4 K_{2} S O_{4}+ ) ( C r_{2}left(S O_{4}right)_{3}+3 I_{2}+7 H_{2} O ) |
12 |
| 687 | Which of the following statement(s) is/are not correct? A ( cdot L a_{2}(O H)_{3} ), is less basic than ( L u_{2}(O H)_{3} ) B. In Lanthanoid series ionic radius of ( operatorname{Ln} ) n ( 3^{wedge} ) + ions decreases c. La is actually an element of transition series rather than Lanthanoid series D. Atomic radii of Zr and Hf are same because of Lanthanide contraction |
12 |
| 688 | Question 4. Transition elements show high melting points. Why? |
12 |
| 689 | Which of the following has tendency to ( operatorname{act} ) as an oxidising agent? ( A cdot C e^{4} ) B. ( mathrm{Sm}^{2+} ) ( c cdot L u^{3} ) D. ( operatorname{Gd}^{3} ) |
12 |
| 690 | The size of Mo is very similar to: A . ( L a ) в. ( H f ) ( c . T a ) D. ( W ) |
12 |
| 691 | In aqueous solution ( boldsymbol{E} boldsymbol{u}^{2+} ) acts as A. an oxidsing agent B. reducing agent c. can act as either of these D. can act as redox agent |
12 |
| 692 | The Lanthanoid have the genera configuration A ( cdot 5 f^{1-14} 5 s^{2} p^{6} d^{0-1} 6 s^{2} ) B . ( (n-2) f^{1-14}(n-1) d^{1-2} n s^{2} ) ( mathbf{c} cdot 5 f^{1-14} 6 s^{2} p^{6} 6 s^{2} ) D. ( n s^{2} n p^{1-6} ) |
12 |
| 693 | Which one of the following is ‘ ( d ) -block element? A. ( G d ) в. ( H s ) c. ( E s ) D. ( C s ) |
12 |
| 694 | Which of the following process does not occur during the formation of ( boldsymbol{C H C l}_{3} ) from ( C_{2} H_{5} O H ) and ( C a O C l_{2} ? ) A. Hydrolysis B. Oxidation c. Reduction D. chlorination |
12 |
| 695 | Question 36. Comment on the statement that elements of the first transition series possess many properties different from those of heavier transition elements. |
12 |
| 696 | The colour of ( C u_{2} C r_{2} O_{7} ) solution in water is : A. green B. blue c. orange D. black |
12 |
| 697 | How would you account for the following: (i) Among lanthanoids, ( ln (| I) ) compounds are predominant. However, occasionally in solution or in solid compounds, +2 and +4 ions are also obtained. (ii) The ( E_{M^{2+} / M}^{o} ) for copper is positive ( (0.34 mathrm{V}) . ) Copper is the only metal in the first series of transition elements showing this behavior. (iii) The metallic radii of the third (5d) series of transition metal are nearly the same as those of the corresponding members of the second series. |
12 |
| 698 | Pyrolusite is ( M n O_{2} stackrel{I}{rightarrow} M n O_{4}^{2-} stackrel{I I}{rightarrow} ) ( M n O_{4} ) Steps I and II are respectively: This question has multiple correct options A. fuse with KOH / air and electrolytic oxidation. B. fuse with ( K O H / K N O_{3} ) and electrolytic oxidation. c. fuse with conc. ( H N O_{3} / a i r ) and electrolytic reduction. D. dissolve in ( H_{2} O ) and oxidation |
12 |
| 699 | Magnetic moments of ( boldsymbol{C r}(boldsymbol{Z}=mathbf{2 4}) ) ( operatorname{Mn}(Z=25) ) and ( F e(Z=26), ) are ( boldsymbol{x}, boldsymbol{y}, boldsymbol{z} ) They are in order: A. ( x<y<z ) В. ( x=yy>z ) D. ( x=y=z ) |
12 |
| 700 | The general electronic configuration of f-block elements is: A ( cdot(n-2) f^{1-14}(n-1) d^{0-1} n s^{2} ) B . ( (n-2) f^{1-14}(n-1) d^{0-10} n s^{1} ) C. ( (n-2) f^{1-10}(n-1) d^{0-1} n s^{2} ) D ( cdot(n-2) f^{1-14}(n-1) d^{0-1} n s^{1} ) |
12 |
| 701 | (a) How would you account for the following: (i) The chemistry of actinoids is more complicated as compared to lanthanoids (ii) Transition metals form complex compounds (b) Complete the following equation: [ mathbf{2} M n O_{4}^{-}+6 H^{+}+S O_{3}^{2-} longrightarrow ] |
12 |
| 702 | Cerium ( (z=58) ) is an important member of the Lanthanides. Which of the following statements about cerium is incorrect? A. The +3 oxidation state of cerium is more stable than the +4 oxidation state B. The common oxidation states of cerium are +3 and +4 c. Cerium (IV) acts as an oxidizing agent D. The +4 oxidation state of cerium is not known in solutions |
12 |
| 703 | Which of the following are correct statements? This question has multiple correct options |
12 |
| 704 | Statement 1: Lanthanides have much less tendency to form complexes than actinides. Statement 2: Compared to actinides, the lanthanides have relatively larger size of atoms and less nuclear charge. |
12 |
| 705 | Assertion The ( 4 f- ) and ( 5 f ) – inner transition series of elements are placed separately at the bottom of the periodic table. Reason (i) This prevents the undue expansion of the periodic table i.e., maintains its structure. (ii) This preserves the principle of classification by keeping elements with similar properties in a single column. 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 |
12 |
| 706 | 0.38 When a brown compound of manganese (A) is treated with HCl it gives a gas (B). The gas taken in excess, reacts with NH2 to give an explosive compound (C). Identify compounds A, B and C. Thinline |
12 |
| 707 | Transition metals and their compounds catalyse reactions because: A. they have completely filled ( s ) – subshell. B. they have a comparable size due to poor shielding of d-subshell. C. they introduce an entirely new reaction mechanism with lower activation energy. D. they have variable oxidation states. |
12 |
| 708 | The oxidation state of chromium in the final product formed by the reaction between KI and acidified potassium solution is: ( A cdot+4 ) B. +6 ( c cdot+2 ) ( D cdot+3 ) |
12 |
| 709 | Which of the following is paramagnetic as well as coloured ion? A ( cdot C u^{+} ) в. ( C u^{2} ) ( c cdot S c^{3} ) D. ( T i^{4} ) |
12 |
| 710 | From the below-given pairs, which is more stable? ( boldsymbol{C r} boldsymbol{O}_{4}^{2-}-ldots-boldsymbol{M o} boldsymbol{O}_{4}^{2-} ) A ( cdot C r O_{4}^{2-}=M o O_{4}^{2-} ) B . ( C r O_{4}^{2-}M o O_{4}^{2-} ) D. None of these |
12 |
| 711 | Q. 42 Although Zr belongs to 4d and Hf belongs to 5d transition series but it is quite difficult to separate them, Why? |
12 |
| 712 | The Lanthanoid contraction refers to decrease in the: A. valence electrons of the Lanthanide series B. ionic radius of the series c. the density of the series D. nuclear mass of the series |
12 |
| 713 | In the following electronic configuration ( n s^{2}(n-1) d^{0-1}(n-2) f^{1-14} . ) If value of ( (boldsymbol{n}-mathbf{1})=mathbf{6} ) the configuration will be of: A. lanthanides B. d- block c. actinides D. s – block |
12 |
| 714 | The aqueous solution of the following salts will be colored in the case of This question has multiple correct options ( mathbf{A} cdot Z nleft(N O_{3}right)_{2} ) ( mathbf{B} cdot L i N O_{3} ) ( mathbf{c} cdot operatorname{Co}left(N O_{3}right)_{2} ) ( mathbf{D} cdot C r C l_{3} ) |
12 |
| 715 | If the following ion(s) is/are coloured enter ( 1, ) else enter 0 ( boldsymbol{C} boldsymbol{a}^{2+} ) |
12 |
| 716 | What are the different oxidation states exhibited by the lanthanoids? |
12 |
| 717 | Question 5. How would you account for the irregular variation of ionisation enthalpies (first and second) in the first series of the transition elements? |
12 |
| 718 | What is the correct order of the covalent size of Cr and Mo? A. ( mathrm{cr}=mathrm{Mo} ) B. CrsMo ( c cdot c r>M o ) D. None of these |
12 |
| 719 | Increasing basic properties of ( T i O_{2}, Z r O_{2} ) and ( H f O_{2} ) are in order: A. ( T i O_{2}<Z r O_{2}<H f O_{2} ) в. ( H f O_{2}<Z r O_{2}<T i O_{2} ) c. ( H f O_{2}<T i O_{2}<Z r O_{2} ) D. ( Z r O_{2}<T i O_{2}<H f O_{2} ) |
12 |
| 720 | Which of the following is the most basic? A ( cdot C e(O H)_{3} ) в. ( L u(O H)_{3} ) ( mathbf{c} cdot Y b(O H)_{3} ) D. ( A l(O H)_{3} ) |
12 |
| 721 | Assertion ( Z r ) and ( H f ) occur together in nature and are difficult to separate. Reason ( Z r ) and ( H f ) have identical radii due to lanthanide contraction. 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 |
12 |
| 722 | Lanthanide are: A. 14 element in the sixth period (atomic no. ( =90 ) to 103 ) that are filling ( 4 f ) -sublevel B. 14 element in the seventh period (atomic no. ( =90 ) to 103) that are filling 5f-sublevel C. 14 element in the sixth period (atomic no. ( =58 ) to 71 ) that are filling ( 4 f ) -sublevel D. 14 element in the seventh period (atomic no. ( =58 ) to 71 ) that are filling ( 4 f ) -sublevel |
12 |
| 723 | The inner transition elements are the elements in which the added electrons go to: ( A cdot(n-1) d- ) orbitals B. (n-2) f-orbitals c. (n-1) d-orbitals and (n-1) f-orbitals D. (n-1) d-orbitals and ns orbitals |
12 |
| 724 | The colour of ( M n O_{4}^{-} ) ion is due to charge transfer. If true enter 1 , else enter 0 . |
12 |
| 725 | Formula for argentite, horn silver and pyragyrite are respectively? ( mathbf{A} cdot A g_{2} S, A g C l ) and ( A g_{3} S b S_{3} ) B. ( A g C l, A g_{3} S b S_{3} ) and ( A g_{2} S ) ( mathbf{c} cdot A g_{3} S b S_{3}, A g_{2} S ) and ( A g C l ) D. ( A g C l A g_{2} S ) and ( A g_{3} S b S_{3} ) |
12 |
| 726 | Transition metals have the general electronic configuration? A ( cdot n s^{2} n d^{1-10} ) В ( cdot n s^{2} n p^{1}(n-1) d^{1-10} ) c. ( n s^{1-2}(n-1) d^{1-10} ) D. ( n s^{2} n p^{6}(n-1) d^{1-1} ) |
12 |
| 727 | Give one point of dissimilarity between lanthanides and actinides. | 12 |
| 728 | Due to lanthanide contraction A. Fe, Co, Ni have equal size B. Zr and Hf have equal size C. all f-block ions have equal size D. all isoelectronic ions have equal size |
12 |
| 729 | Which substance does not possess a peroxy cyclic ring? ( mathbf{A} cdot mathrm{CrO}_{5} ) ( mathbf{B} cdot B a O_{2} ) ( mathbf{c} cdot H_{2} S_{2} O_{8} ) D. All have peroxy linkage |
12 |
| 730 | Most oxidsing agent is: ( mathbf{A} cdotleft[W O_{4}right]^{2-} ) B. ( left[mathrm{CrO}_{4}right]^{2-} ) c. ( left[mathrm{Ce} mathrm{O}_{4}right]^{2} ) D. ( left[M n O_{4}right]^{2-} ) |
12 |
| 731 | Which one of the following species is stable in aqueous solution A ( cdot M n O_{4}^{2} ) в. ( M n O_{4}^{3} ) ( c cdot C r^{2} ) D. ( C u^{+} ) |
12 |
| 732 | The actinoids exhibit more number of oxidation states in general than lanthanoids because: A. the ( 5 f ) orbitals are more buried than the 4 f orbitals B. there is a similarity between ( 4 f ) and ( 5 f ) orbitals in their angular part of the wave function C. the actinoids are more reactive than the lanthanoids D. the ( 5 f ) orbitals extend further from the nucleus than the ( 4 f ) orbitals |
12 |
| 733 | 18 When acidified K Cr,0, solution is added to Sn2+ salt then Sn2 changes to way sn (a) Sn o b Snaio (c) Sn 4+ (b) Sni+ (d) Sn+ |
12 |
| 734 | 46. Which of the following metals has least melting point ? (1) Gold (2) Silver (3) Mercury (4) Copper |
12 |
| 735 | For ( Z n^{2+}, N i^{2+}, C u, ) and ( C r^{2+} ) which of the following statements is correct? A. only ( Z n^{2+} ) is colourless and ( N i^{2+}, C u^{2+} ) and ( C r ) are coloured B. All the ions are coloured c. All the ions are colourless D. ( Z n^{2+} ) and ( C u^{2+} ) are colourless while ( N i^{2+} ) and ( C r^{2+} ) are coloured |
12 |
| 736 | What is the best reagent would you choose to convert ( M n O_{4}^{2-} ) to ( M n O_{4}^{-} ? ) A ( cdot C l_{2} ) water в. ( O_{3} ) c. Both ( A ) and ( B ) D. None of these |
12 |
| 737 | Identify the incorrect statement among the following. A. Lanthanide contraction is the accumulation of successive shrinkages. B. As a result of lanthanoid contraction, the properties of 4d series of the transition elements have no similarities with the ( 5 mathrm{d} ) series of elements. C. Sheilding power of 4f electrons is quite weak. D. There is a decrease in the radii of the atoms or ions as one proceeds from La to Lu. |
12 |
| 738 | Lanthanoids contraction is observed in: A. ( H f ) в. ( A t ) ( c cdot X e ) D. ( A c ) |
12 |
| 739 | If ( K M n O_{4} ) is reduced by oxalic acid in an acidic medium, then the oxidation number of ( M n ) changes from: A. +4 to +2 B. +6 to +4 ( c cdot+7 t o+2 ) D. +7 to +4 |
12 |
| 740 | Discuss the consequences of lanthanide contraction. |
12 |
| 741 | The electronic configuration of actinides is: A ( cdot[operatorname{Rn}] 5 f^{0-14} 6 d^{0-2} 7 s^{1} ) B . ( [R n] 5 f^{0-14} 6 d^{0} 7 s^{0} ) C ( cdot[R n] 5 f^{0-14} 6 d^{0-2} 7 s^{2} ) D cdot ( [R n] 5 f^{0-14} 6 d^{0-2} 7 s^{0} ) |
12 |
| 742 | Cholrine gas is produced from HCl by the addition of: A. ( K_{2} S O_{4} ) в. КСl c. ( K N O_{3} ) D. ( K M n O_{4} ) |
12 |
| 743 | The correct statement(s) about ( C r^{2+} ) and ( M n^{3+} ) is(are): [Atomic numbers of ( mathbf{C r}=mathbf{2 4} ) and ( mathbf{M n}= ) This question has multiple correct options A. ( C r^{2+} ) is a reducing agent B. ( M n^{3+} ) is an oxidizing agent c. Both ( C r^{2+} ) and ( M n^{3+} ) exhibit ( d^{4} ) electronic configuration D. When ( C r^{2+} ) is used as a reducing agent, the chromium ion attains ( d^{5} ) electronic configuration |
12 |
| 744 | Pick out the correct statement(s): This question has multiple correct options ( mathbf{A} cdot M n O_{2} ) dissolves in conc. ( H C l ) but does not form ( M n^{4+} ) ions. B. Decomposition of acidic ( K M n O_{4} ) is not catalysed by sunlight C ( . M n O_{4}^{2-} ) is strongly oxidising and stable only in a very strong alkali. In dilute alkali, water or acidic solutions it dispropotionates. D. ( K M n O_{4} ) does not act as oxidising agent in alkaline medium. |
12 |
| 745 | Potassium dichromate in alkaline solution, with ( 30 % mathrm{H}_{2} mathrm{O}_{2} ) produces: A ( cdot K_{3} C r O_{8} ) в. ( operatorname{Cr} mathrm{O}left(mathrm{O}_{2}right)_{2} ) ( mathrm{c} cdot mathrm{CrO}_{3} ) D. ( L_{2} ) Cr ( O_{4} ) |
12 |
| 746 | Explain why: Zr and Hf exhibit similar properties. (At. no. of ( mathrm{Zr}=40, mathrm{Hf}=72) ) |
12 |
| 747 | In which of the following Lanthanoids oxidation state +2 is most stable? A . ( mathrm{c} ) B. Eu ( c cdot T b ) D. Dy |
12 |
| 748 | Magnetic moment of ( F e^{3+} ) ions ( sqrt{35} ) BM. Determine number of unpaired electrons. |
12 |
| 749 | The electronic configuration of a transition element ‘ ( X^{prime} ) in +3 oxidation state is ( [A r] 3 d^{5} . ) What is its atomic number? A .24 B . 25 ( c cdot 26 ) D. 27 |
12 |
| 750 | What is the oxidation state of ( C r ) in ( boldsymbol{C r} boldsymbol{O}_{5} ? ) |
12 |
| 751 | In which of the following pairs are both the ions coloured in aqueous solution? [At. No. ( : S c=21, T i=22, N i= ) ( mathbf{2 8}, boldsymbol{C u}=mathbf{2 9}, boldsymbol{C o}=mathbf{2 7}] ) A ( cdot N i^{2+}, T i^{3+} ) B. ( S c^{3+}, T i^{3+} ) ( mathbf{c} cdot S c^{3+}, C o^{2+} ) D. ( N i^{2+}, C u^{+} ) |
12 |
| 752 | Among ( mathrm{K}, mathrm{Ca}, mathrm{Fe} ) and ( mathrm{Zn}, ) the elements which can form more than one binary compound with chlorine is: ( A cdot F e ) B. zn ( c cdot k ) D. ca |
12 |
| 753 | Select the correct order of ions with respect to their ionic radii. A. ( Y^{3+}<L u^{3+}<E u^{3+}<L a^{3+} ) B . ( L u^{3+}<Y^{3+}<E u^{3+}<L a^{3+} ) c. ( L u^{3+}<E u^{3+}<L a^{3+}<Y^{3+} ) D. ( L a^{3+}<E u^{3+}<L u^{3+}<Y^{3+} ) |
12 |
| 754 | What are the constituents of ‘Mischmetal’? A. ( L a, F e ) в. ( L a, C e ) c. ( F e, C e ) D. Ce.Cu |
12 |
| 755 | Compare thermal stability of ( Z n O ) ( C d O ) and ( H g O ) A. ( Z n O>C d O>H g O ) в. ( C d O>Z n O>H g O ) c. ( Z n O>H g O>C d O ) D. ( H g O>Z n O>C d O ) |
12 |
| 756 | The position in the periodic table to which ( F e ) and ( Z n ) elements belong to A . Alkali metal B. Alkaline earth metal c. d-block D. None of these |
12 |
| 757 | ( N a^{+} ) is coloured. If the given statement is correct enter 1 else enter 0 |
12 |
| 758 | ( boldsymbol{X}+boldsymbol{K}_{2} boldsymbol{C O}_{3}+ ) Air ( stackrel{text {heat}}{longrightarrow}(boldsymbol{Y}) ) ( boldsymbol{Y}+boldsymbol{C l}_{2} rightarrow boldsymbol{Z}(text { pink }) ) Which of the following is correct? A. ( X= )Black,MnO( _{2} ; Y= )Blue,K( _{2} )Cr( O_{4} ; Z=K M n O_{4} ) B. ( X= )Green, ( C r_{2} O_{3} ; Y= )Yellow,K( _{2} C r O_{4} ; Z= ) ( K_{2} C r_{2} O_{7} ) c. ( X= )Black,MnO( _{2} ; Y= )Green, ( K_{2} ) Mn ( O_{4} ; Z= ) ( K M n O_{4} ) D. ( X= )Black, Bi( _{2} ) O( _{3} ; Y= )Colourless, KBiO( _{2} ; Z= ) ( K B i O_{3} ) |
12 |
| 759 | Question 14. The halides of transition elements become more covalent with increasing oxidation state of the metal. Why? |
12 |
| 760 | In the laboratory, ( M n O_{2} ) is made by: A. heating ( M n ) in ( O_{2} ) B. oxidising ( M n^{2+} ) C. electrolytic oxidation of ( M n S O_{4} ) D. titration of ( K M n O_{4} ) in alkaline medium |
12 |
| 761 | ( T i^{4+} ) ion is colourless. Give reason | 12 |
| 762 | Which of the following exhibits only +3 oxidation state? A. ( T h ) в. ( A c ) ( c . P a ) D. ( U ) |
12 |
| 763 | ( C u^{2+} ) is stable in aqueous medium due to A . ( d^{10} ) configuration B. ( d^{9} ) configuration c. ( I P_{2}>I P_{1} ) D. Hydtation energy overcomes the other endothermic processes |
12 |
| 764 | Question 8. Although Cr3+ and Co-+ ions have same number of unpaired electrons but the magnetic moment of Cris 3.87 BM and the of Co2+ is 4.87 BM Why? |
12 |
| 765 | In the general electronic configuration, ( (n-2) f^{1-14}(n-1) d^{01} n s^{2}(text { where } n=7) ) the configuration will be of: A. lanthenides B. actinides c. transition elements D. none |
12 |
| 766 | Statement 1: An element that has an electron configuration of ( 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{3} 4 s^{2} ) is a transition element. Statement 2: The transition elements from scandium to zinc are filling the ( 3 d ) orbitals. 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. |
12 |
| 767 | Q. 60 Assertion (A) Separation of Zr and Hf is difficult. Reason (R) Because Zr and Hf lie in the same group on Table. |
12 |
| 768 | Q.5 On addition of small amount of KMnO to concentrated H2304 compound is obtained which is highly explosive in nature. tuen compound from the following. (a) Mn 07 (b) MnO₂ (c) MnSO4 (d) Mn203 |
12 |
| 769 | What is the oxidation state of coloured ion in ( left[boldsymbol{C o}left(boldsymbol{H}_{2} boldsymbol{O}right)_{6}right]^{3+} ? ) |
12 |
| 770 | Which of the following pair have almost similar size A ( cdot T i_{22} ) and ( Z r_{4} ) B. ( N b_{41} ) and ( T a_{73} ) C ( cdot Y_{39} ) and ( L a_{57} ) D. ( C a_{20} ) and ( I r_{r} ) |
12 |
| 771 | Which of the follwing is the correct electronic configuration of ( boldsymbol{F} boldsymbol{e}^{+3} boldsymbol{i o n}left(boldsymbol{Z}_{boldsymbol{F} e}=boldsymbol{2} boldsymbol{6}right) ? ) ( mathbf{A} cdot[A r] 3 d^{6} ) B . ( [A r] 3 d^{5} ) ( mathbf{c} cdot[A r] 3 d^{6} 4 s^{2} ) D cdot ( [A r] 3 d^{6} 4 s^{1} ) |
12 |
| 772 | Experimental value of magnetic momentum of ( M n^{2+} ) complex is 5.96 B.M. This indicates: A. Axial and orbital motion of electron in same direction B. Axial and orbital motion of electron in opposite direction C. Electron does not exhibit orbital motion, it only exhibits axial motion D. Electron does not exhibit axial motion, it only exhibits orbital motion |
12 |
| 773 | Assertion Reduction potential of ( M n(+3 t o+2) ) is more positive than ( boldsymbol{F e}(+boldsymbol{3} text { to }+mathbf{2} ) ). Reason lonisation potential of ( M n ) is more than that of ( F e ) 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 |
12 |
| 774 | Oxidation states shown by lanthanoids is/are This question has multiple correct options ( A cdot+2 ) B. +3 ( c cdot+4 ) D. None of these |
12 |
| 775 | The reason for greater range of oxidation states in actinoids is attributed to: A. ( 4 f ) and ( 5 d ) levels being close in energies. B. the radioactive nature of actinoids c. actinoid contraction. D. ( 5 f, 6 d ) and ( 7 s ) levels having comparable energies |
12 |
| 776 | form oxocations. A. Lanthanides B. Actinides c. Noble gas D. Alkali metalss |
12 |
| 777 | Which of the following is least basic? A ( cdot L a(O H)_{3} ) ( mathbf{B} cdot L u(O H)_{3} ) c. ( operatorname{Ce}(O H)_{3} ) D. ( N d(O H)_{3} ) |
12 |
| 778 | Why are metals like chromium and molybdenum very hard? |
12 |
| 779 | S ALA PIOLET Question 5. What may be the stable oxidation state of the transition element with the following d-electron configuration in the ground state of their atoms : 3d, 3d, 3d8 and 3d”? |
12 |
| 780 | Larger number of oxidation states are exhibited by the actinoids than those by the lanthanoids, the main reason being: A. more reactive nature of the actinoids than the lanthanoids B. 4f orbitals more diffused than the 5 f orbitals c. more energy difference between 5 5 and ( 6 d ) than between 4 f and 5d orbitals D. lesser energy difference between 5 and ( 6 d ) than between ( 4 mathrm{f} ) and ( 5 mathrm{d} ) orbital |
12 |
| 781 | Cerium shows oxidation state of +4 because: ( mathbf{A} ). it resembles alkali metals B. it has very low I.E. C. it has tendency to attain noble gas configuration D. it has tendency to attain ( f^{0} ) configuration |
12 |
| 782 | Which of the following elements is placed just after actinide series? This question has multiple correct options A. Rutherfordium B. Unnilpentium c. Unnilquadium D. Ununbium |
12 |
| 783 | Which of the following statements is not correct? ( mathbf{A} cdot L a(O H)_{3} ) is less basic than ( L u(O H)_{3} ) B. In lanthanide series, radii of elements decreases with an increase in atomic number C . ( L a ) is actually an element of transition series rather than lanthanides D. Atomic radii of ( Z r ) and ( H f ) are same because of lanthanide contraction |
12 |
| 784 | Which one of the following ions is the most stable in aqueous solution? ( [A t . text { no.; } T i=22, V-23, C r=24 ; M n=25] ) A ( cdot C r^{3} ) в. ( V^{3} ) ( mathrm{c} cdot T i^{3} ) ( mathbf{D} cdot M n^{3} ) |
12 |
| 785 | The molecular formula of Rinmann’s green is A ( . F e S O_{4} 7 H_{2} O ) в. ( C r C l_{3} ) c. ( N i S O_{4} 7 H_{2} O ) D. ( operatorname{CoOZnO} ) |
12 |
| 786 | Titanium shows the magnetic moment of 1.73 B.M. in its compound. What is the oxidation number of ( boldsymbol{T} boldsymbol{i} ) in the compound? ( A cdot+1 ) ( B .+4 ) ( c cdot+3 ) ( D cdot+2 ) |
12 |
| 787 | Let, paramagnetism is given by the relation ( mu=2 sqrt{s(s+1)} ) magnetons where ‘s’ is the total spin. On this basis, the pramagnetism of ( C u^{+} ) ion is: A . 3.88 magnetons B. 2.83 magnetons c. 1.41 magnetons D. zero |
12 |
| 788 | The atomic and ionic radii ( left(M^{3+} text { ions }right) ) of Lanthanide elements decrease with increase in atomic number. This effect is called as: A. Lanthanoid contraction B. Lanthanoid expansion c. Actinoid contraction D. none of these |
12 |
| 789 | Ouestion 28. What are inner-transition elements? Decide which of the following atomic numbers are the atomic numbers of the inner-transition elements : 29, 59, 74, 95, 102, 104? (0) Inner-transition means their(n-2) sub shell is filled by electrons. (ii) Write electronic configuration for all the given atomic numbers. If the last electron enters in (n-2) of subshell, it is an inner-transition element, otherwise not. |
12 |
| 790 | Question 3. Which of the 3d series of the transition metals exhibits the largest number of oxidation states and why? |
12 |
| 791 | Question 32. Name the members of the lanthanoid series which exhibit +4 oxidation states and those which exhibit +2 oxidation states. Try to correlate this type of behaviour with the electronic configurations of these elements. Empty, half-filled or completely filled shells are more stable than partially filled shells. |
12 |
| 792 | Ferric sulphate is represented by which formula? A. ( F e S O_{4} ) в. ( F e S O_{3} ) ( mathrm{c} cdot mathrm{Fe}left(mathrm{SO}_{4}right)_{2} ) D. ( F e_{2}left(S O_{4}right)_{3} ) |
12 |
| 793 | Give reason: ( left[boldsymbol{T} boldsymbol{i}left(boldsymbol{H}_{2} boldsymbol{O}right)_{6}right]^{3+} ) is coloured while ( left[S cleft(H_{2} Oright)_{6}right]^{3+} ) is colourless |
12 |
| 794 | Why ( Z n^{2+} ) is diamagnetic whereas ( C r^{3+} ) is paramagnetic? |
12 |
| 795 | An organic compound ( [A] ) having molecular formula ( C_{2} H_{7} N ) on treatment with nitrous acid gives a compound ( [boldsymbol{B}] ) having molecular formula ( C_{2} H_{6} O .[B] ) on treatment with an organic compound ( [C] ) gives a carboxylic acid ( [D] ) and a sweet smelling compound ( [boldsymbol{E}] . ) Oxidation of ( [boldsymbol{B}] ) with acidified potassium dichromate also gives ( [boldsymbol{D}] ) Identify ( [boldsymbol{A}],[boldsymbol{B}],[boldsymbol{C}],[boldsymbol{D}] ) and ( [boldsymbol{E}] ) |
12 |
| 796 | General electronic configuration of lanthanides is: ( mathbf{A} cdot(n-2) f^{1-14}(n-1) d^{0-1} n s^{2} ) B . ( (n-2) f^{10-14}(n-1) d^{10-1} n s^{2} ) C ( cdot(n-2) f^{0-14}(n-1) d^{10} n s^{2} ) D. ( (n-2) d^{0-1}(n-1) f^{1-14} n s^{2} ) |
12 |
| 797 | Select the coloured compound amongst the following: (Atomic no. ( boldsymbol{T} boldsymbol{i}=mathbf{2} 2, boldsymbol{C r}=mathbf{2 4}, boldsymbol{C u}= ) ( mathbf{2 9}, mathbf{Z n}=mathbf{3 0} mathbf{)} ) A. ( T i C l_{4} ) в. ( C r C l_{3} ) c. ( Z n C l_{2} ) D. ( C u C l ) |
12 |
| 798 | Which of the following group belongs to actinide series? A. Th, Pa, U B. Ce Pr, Nd c. Ва, La, нf D. Pt, Au, Ag |
12 |
| 799 | Q.9 The elements in which electrons are progressively filled in 4f-orbital are called (a) actinoids (b) transition elements (c) lanthanoids und (d) halogens |
12 |
| 800 | 2. 16 KMnOacts as an oxidising agent in alkaline medium. When alkaline KMnO4 is treated with KI, iodide ion is oxidised to …….. (a) IZ (b) 10 (c) IO; (d) IO |
12 |
| 801 | Which one of the following ion exhibits colour in aqueous solution? ( A cdot S c^{3} ) B. Ni2 c. ( T_{i}^{4} ) ( D cdot z n^{+2} ) |
12 |
| 802 | Which of the following lanthanide is commonly used? A. Lanthanium B. Nobelium c. Thorium D. Cerium |
12 |
| 803 | What would happen when a solution of potassium chromate is treated with an excess of dilute nitric acid? This question has multiple correct options A ( cdot C r_{2} O_{7}^{2-} ) and ( H_{2} O ) are formed B . ( C r O_{7}^{2-} ) is reduced to +3 state of ( C r ) ( mathrm{c} cdot mathrm{Cr} mathrm{O}_{7}^{2-} ) is oxidized to +7 state of ( mathrm{Cr} ) D. ( C r^{3+} ) and ( C r_{2} O_{7}^{2-} ) are formed |
12 |
| 804 | Q. 66 When an oxide of manganese (A) is fused wi an oxide of manganese (A) is fused with KOH in the presence of an ing agent and dissolved in water, it gives a dark green solution of vound (B). Compound (B) disproportionates in neutral or acidic ? to give purple compound (C). An alkaline solution of compound ( oxidises potassium iodide solution to a compound (D) and compound (A) is also formed. Identify compounds A to D and also explain the reactions involved. |
12 |
| 805 | How do you account for the larger size of lanthanum than hafnium though they are successive elements? | 12 |
| 806 | Potassium manganate ( left(mathrm{K}_{2} mathrm{MnO}_{4}right) ) is formed. When : This question has multiple correct options A. cuprous oxide reacts with alkaline ( mathrm{KMnO}_{4} ) solution B. manganese dioxide is fused with ( mathrm{K}_{2} mathrm{CO}_{3} ) in presence of ( mathrm{KNO}_{3} ) C. formaldehyde reacts with potassium permanganate in presence of concentrated potassium hydroxide solution D. potassium permanganate is heated with potassium hydroxide |
12 |
| 807 | Identify the oxidation states of titanium ( (Z=22) ) and copper ( (Z=29) ) in their colourless compounds: A ( cdot T i^{3+}, C u^{2+} ) B. ( T i^{2+}, C u^{2+} ) c. ( T i^{4+}, C u^{+} ) D. ( T i^{4+}, C u^{2+} ) |
12 |
| 808 | Correct order of reducing agent, in ( V^{2+} ) or ( C o^{2+} ) is: A ( cdot V^{2+}=C o^{2+} ) B. ( V^{2+}C o^{2} ) D. none of these |
12 |
| 809 | The only radioactive element among the lanthanoids is: A. gadolinium B. holmium c. promethium D. neodynium |
12 |
| 810 | Which of the following is the strongest base? ( mathbf{A} cdot S c(O H)_{3} ) ( mathbf{B} cdot L a(O H)_{3} ) c. ( L u(O H)_{3} ) D. ( Y b(O H)_{3} ) |
12 |
| 811 | At ( p H=4, C r_{2} O_{4}^{2-} ) exists as: A ( cdot C r O_{4}^{2-} ) в. ( C r O_{3} ) ( mathrm{c} cdot mathrm{Cr} mathrm{O}_{2}^{2+} ) D. ( C r_{2} O_{7}^{2} ) |
12 |
| 812 | Select the correct statements: This question has multiple correct options A. The +1 oxidation state compared to the +3 oxidation state gets gradually more stabilized as we move from top to bottom in III group. B. TI (III) being unstable, acts as a good oxidizing agent to get reduced to TI (II). ( mathrm{C} cdot operatorname{Sn} mathrm{Cl}_{2} ) is good oxidizing agent. D. All are incorrect. |
12 |
| 813 | Write any three salient features of oxidation states of transition elements. | 12 |
| 814 | What are interstitial compounds? Why are such compounds well known for transition metals? | 12 |
| 815 | The number of oxidation states is exhibited by the actinoids more than by the lanthanide. The main reason for this is: A. more energy difference between 5 f and 6 d orbital than that between 4 f and 5 d orbitals. B. the lesser energy difference between 5 and ( 6 d ) orbital than between ( 4 f ) and ( 5 d ) orbitals C. the greater metallic character of the lanthanoids than that of the corresponding actinoids D. more active nature of the actinoids |
12 |
| 816 | Assertion Equivalent mass of ( K M n O_{4} ) is equal to one-fifth of its molecular mass when it acts as an oxidisng agent in acidic medium. Reason Oxidation number of ( M n ) in ( K M n O_{4} ) is +7 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 |
12 |
| 817 | The magnetic nature of elements depends on the presence of unpaired electrons. Identify the configuration of transition elements which shows highest magnetic moment? A ( cdot 3 d^{2} ) B. ( 3 d^{8} ) ( c cdot 3 d^{7} ) D. ( 3 d^{5} ) |
12 |
| 818 | Which of the following is a lanthanide? A. Curium B. Californium c. Uranium D. Europium |
12 |
| 819 | The colour imparted by ( operatorname{Co}(boldsymbol{I} boldsymbol{I}) ) compounds to glass is A. green B. deep blue c. yellow D. red |
12 |
| 820 | Lanthanoid elements have: A. similar lattice and solvation energies but widely different ionization energies B. similar lattice and ionization energies but widely different solvation energies C. similar ionization and solvation energies but widely different lattice energies D. similar lattice, solvation and ionization energies |
12 |
| 821 | Lanthanoid contraction is caused due to: A. the same effective nuclear charge from ( C e ) to ( L u ) B. the imperfect shielding on outer electrons by ( 4 f ) electrons from the nuclear charge C. the appreciable shielding on outer electrons by ( 4 f ) electrons from the nuclear charge D. the appreciable shielding on outer electrons by ( 5 d ) electrons from the nuclear charge |
12 |
| 822 | Write one similarity and one difference between the chemistry of lanthanoids and that of actinoids. |
12 |
| 823 | Define lanthanoid contraction. Explain its effects. |
12 |
| 824 | Most common oxidation state of Ce (Cerium) are: ( A cdot+3,+4 ) ( B cdot+2,+3 ) ( c cdot+2,+4 ) ( D cdot+3,+5 ) |
12 |
| 825 | Give two reactions in which transition metals or their compound acts as catalysts. |
12 |
| 826 | Which of the following is the stable electronic configuration of ( F e^{3+} ) ion? A ( cdot 3 d^{6} 6 s^{0} ) B. ( 3 d^{5} s s^{0} ) c. ( 3 d^{6} 4 s^{2} ) D. ( 3 d^{4} 4 s^{2} ) |
12 |
| 827 | An element with atomic number 21 is a: A. halogen B. representative element c. transition element D. alkali element |
12 |
| 828 | Due to lanthanide contraction: A. ( F e, C o, N i ) have equal size B. ( Z r ) and ( H f ) have equal size C. all ( f- ) block ions have equal size D. all isoelectronic ions have equal size |
12 |
| 829 | Identify the correct Structure of dichromate ion. ( A ) в. c. ( D ) |
12 |
| 830 | Standard reduction potential of most of the transition elements is generally: A. negative B. positive c. zero D. none of the above |
12 |
| 831 | The oxidising ability of the given anions follows the order: A ( cdot operatorname{Ti} 0_{4}^{4-}<V O_{4}^{3-}<C r O_{4}^{2-}<M n O_{4} ) B. ( V O_{4}^{3-}<C r O_{4}^{2-}<M n O_{4}^{-}<T i O_{4}^{4} ) c. ( C r O_{4}^{2-}<M n O_{4}^{-}<V O_{4}^{3-}<T i O_{4}^{4} ) D. ( V O_{4}^{3-}<T i O_{4}^{4-}<C r O_{4}^{2-}<M n O_{4} ) |
12 |
| 832 | Which of the following has been arranged in order of increasing bond strength: A ( cdot Z n_{2}^{2+}<H g_{2}^{2+}<C d_{2}^{2} ) B ( cdot C d_{2}^{2+}<H g_{2}^{2+}<Z n_{2}^{2} ) c. ( Z n_{2}^{2+}<C d_{2}^{2+}<H g_{2}^{2} ) D. ( H g_{2}^{2+}<C d_{2}^{2+}<Z n_{2}^{2+} ) |
12 |
| 833 | Which one of the following statements about lanthanides is false? A. Lanthanides are separated from one another by ion exchange method B. The ionic radii of trivalent lanthanides steadily increases with increase in atomic number C. All lanthanides are highly dense metals D. Most typical oxidation state of lanthanides is +3 |
12 |
| 834 | A salt is made of bivalent ions ( X ) and ( Y ) each of which is capable of decolorizing acidified ( K M n O_{4} ) solution. The salt is likely to be: A. stannic chloride B. ferric sulphate. c. ferrous sulphate. D. ferrous oxalate |
12 |
| 835 | Which one is solid at room temperature? A. Nitrogen B. Potassium permanganate c. Bromine D. Helium |
12 |
| 836 | Which of the following oxidation state is common for all lanthanoids? ( A cdot+2 ) ( B cdot+3 ) ( c cdot+4 ) ( D cdot+5 ) |
12 |
| 837 | The properties of ( Z r ) and ( H f ) are same because A. they have similar radii B. they belong to d-b;ock C. they have same valence electrons D. None of the above |
12 |
| 838 | In which of the following Lanthanoids oxidation state +2 is most stable? A . ( mathrm{c} ) B. Eu ( c cdot T b ) ( D cdot D y ) |
12 |
| 839 | The outer electronic configuration of radioactive element present in IA group is : ( mathbf{A} cdot 8 s^{1} ) B . ( 7 s^{text {। }} ) c. ( 5 s^{text {। }} ) D. ( 6 s^{text {th }} ) |
12 |
| 840 | Silver atom has completely filled d orbitals ( left(4 d^{10}right) ) in its ground state. How can you say that it is a transition element? |
12 |
| 841 | The colorless species is: A. ( V C l_{3} ) в. ( V O S O_{4} ) c. ( N a_{3} V O_{4} ) D ( cdotleft[Vleft(H_{2} Oright)_{6} S O_{4}right] . H_{2} O ) |
12 |
| 842 | Assertion lonic radii of Ta and Nb are same Reason The lanthanide contraction cancels almost exactly the normal size increase on descending a group of transition 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 |
12 |
| 843 | Cr has electronic configuration as: A ( cdot 3 s^{2} 3 p^{6} 3 d^{1} 4 s^{1} ) B . ( 3 s^{2} 3 p^{6} d^{5} 4 s^{1} ) c. ( 3 s^{2} 3 p^{6} 3 d^{6} ) D. None of the above |
12 |
| 844 | When a brown compound of ( mathrm{Mn}(mathrm{A}) ) is treated with ( H C l, ) it gives a gas B. The gas B taken in excess reacts with ( N H_{3} ) to give an explosive compound C. The compounds ( A, B ) and ( C ) are : A. ( A=M n O_{2}, B=C l_{2}, C=N C l_{3} ) В. ( A=M n O, B=C l_{2}, C=N H_{4} C l ) c. ( A=M n_{3} O_{4}, B=C l_{2}, C=N C l_{3} ) D. ( A=M n O_{3}, B=C l_{2}, C=N C l_{2} ) |
12 |
| 845 | Non-Lanthanoid atom is: A . La B . Lu ( c cdot P r ) D. Pm |
12 |
| 846 | The electronic configuration of ( mathrm{Cu}^{+2} ) is: A ( cdot(A r) 4 s^{3} 3 d^{10} ) B . ( (A r) 4 s^{3} 3 d^{10} ) c. ( (A r) 3 d^{9} ) D cdot ( (A r) 4 s^{2} 3 d^{7} ) |
12 |
| 847 | To what extent do the electronic configurations decide the stability of oxidation states in the first series of the transition elements? IIlustrate your answer with examples. |
12 |
| 848 | In which of the following compounds manganese has an oxidation number equal to that of iodine in ( K I O_{4} ? ) A. Potassium manganate B. Potassium permanganate c. Manganous chloride D. Manganese chloride |
12 |
| 849 | Which oxides will not give metal on heating? A. ( H g O ) в. ( Z n O ) c. ( A g_{2} O ) D. All of these |
12 |
| 850 | Which of the following is true regarding derivation of the name of californium? A. The name of californium was derived from the name of the place. B. The name of californium was derived from its color. c. The name of californium was derived from the name of the scientist who discovered it D. The name of californium was derived from mythological character name. |
12 |
| 851 | The element with the electronic configuration ( [X e] 4 f^{14} 5 d^{1} 6 s^{2} ) is a: A. representative element B. transition element C . actinide element D. Lanthanide element |
12 |
| 852 | 0.55 Match the statements given in Column I with the oxidation states given in Column II. Column 1 Column II A. Oxidation state of Mnin Mno, is 11. +2 B. Most stable oxidation state of Mnis 2. +3 C. Most stable oxidation state of Mnin oxides is D. Characteristic oxidation state of lanthanolds is |
12 |
| 853 | When ( S O_{2} ) is passed through acidified ( K_{2} C r_{2} O_{7} ) solution: A. the solution turns blue. B. the solution is decolourised c. ( S O_{2} ) is reduced. D. green ( C r_{2}left(S O_{4}right)_{3} ) is formed |
12 |
| 854 | Which of the following statement is not correct? ( mathbf{A} cdot L a(O H)_{3} ) is less basic than ( L u(O H)_{3} ) B. In lanthanide series ionic radius of ( L n^{3+} ) ion decreases. C. La is actually an element of transition series rather lanthanide. D. Atomic radius of Zr and Hf are same because of lanthanide contraction. |
12 |
| 855 | – LAULUPUS 0.50 While filling up of electrons in the atomic orhitals, the 4s orbital is before the 3d orbital but reverse happens during the ionisalo atom. Explain why? e happens during the ionisation of the |
12 |
| 856 | The maximum oxidation state of osmium is: ( A cdot+6 ) B. +7 ( c cdot+8 ) D. +5 |
12 |
| 857 | Question 2. Why are Mn2+ compounds more stable than Fe2+ towards oxidation to their +3 state? Half-filled orbitals are more stable. |
12 |
| 858 | Assertion The complex ion ( left[C o(e n)_{2} B r_{2}right]^{-} ) has three stereoisomers. Reason The complex ion ( left[C o(e n)_{2} B r_{2}right]^{-} ) has an octahedral geometry. 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 |
12 |
| 859 | Which of the following is least basic? ( mathbf{A} cdot L a(O H)_{3} ) ( mathbf{B} cdot L u(O H)_{3} ) ( mathbf{c} cdot operatorname{Ce}(O H)_{3} ) D. ( N d(O H)_{3} ) |
12 |
| 860 | Which of the following elements involves gradual filling of ( 5 f ) -level? A. Lanthanoids B. Actinoids c. Transition metals D. Coinage metals |
12 |
| 861 | The oxoanion which contains all equivalent ( M-O ) bond is: ( (I) C r O_{4}^{2-} ) ( (I I) M n O_{4}^{-} ) ( (I I I) C r_{2} O_{7}^{2-} ) A. III only В. ( I, I I, I I I ) c. ( I, I I ) D. I only |
12 |
| 862 | Question 9. Ionisation enthalpies of Ce, Pr and Nd are higher than Tu Pa and U. Why? |
12 |
| 863 | 2PPONY Q. 71 A violet compound of manganese (A) decompo oxygen and compounds (B) and (C) of mangan (0 reacts with KOH in the presence of por compound (B). On heating compound () with chlorine gas is liberated and a compound (D) of manganese ato mpound (D) of manganese alongwith other products is formed. Identify compounds A to D and also the reactions involved. of manganese (A) decomposes on heating to liberate pounds (B) and (C) of manganese are formed. Compound KOH in the presence of potassium nitrate to give on heating compound (C) with conc. H2SO4 and NaCl, |
12 |
| 864 | The most widely used commercial chemical as a paint pigment is: A ( cdot ) Ti ( O_{2} ) в. ( operatorname{si} 0_{2} ) c. ( M g O ) D. ( A l_{2} O_{3} ) |
12 |
| 865 | What is oxidation number of ( C r ) in ( left(N H_{3}right)_{3} C r O_{4} ) or ( left(N H_{3}right)_{3} C rleft(O_{2}right)_{2} ? ) |
12 |
| 866 | The transition series that possess elements with maximum oxidation state of +8: A. 1 and 2 series B. 1 and 3 series c. 1,2 and 3 series D. 2 and 3 series |
12 |
| 867 | Explain chromyl chloride test with equation. | 12 |
| 868 | The electronic configuration of cerium is: в. ( [X e] 4 f^{1} 5 d^{1} 6 s^{2} ) ( mathbf{c} cdot[X e] 4 f^{2} 5 d^{0} 6 s^{2} ) D. Both A and B |
12 |
| 869 | The maximum oxidation state shown by ( M n ) in its compound is : ( A cdot+4 ) B. +5 ( c cdot+6 ) D. +7 |
12 |
| 870 | Although, Zr belongs to ( 4 d ) and Hf belongs to ( 5 d ) transition series but it is quite difficult to separate them, why? |
12 |
| 871 | An element ( ^{prime} X^{prime} ) on emitting an ( alpha ) particle, do not change its group number in the periodic table. The element is: A. lanthanum B. cerium c. lawrencium D. radium |
12 |
| 872 | The ( C r O_{3} ) on reaction with ( H C l ) and NaOH(aq) gives, respectively: A ( cdot C r O_{2} C l_{2}, C r O_{4}^{2} ) B. ( operatorname{Cr}(O H)_{2}, C r O_{4}^{2} ) c. ( C l_{2}, C r_{2} O_{7}^{2-} ) D. ( C l_{2}, C r(O H)_{3} ) |
12 |
| 873 | Assertion In transition elements, radii of ( 5 d ) series are virtually the same as those of the corresponding members of ( 4 d ) series. Reason The filling of ( 4 f ) orbitals before ( 5 d ) orbitals results in a regular decrease in atomic radii. 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 |
12 |
| 874 | Select correct statement(s). ( mathbf{A} cdot P u^{4+} ) disproportionates to ( P u^{3+} ) and ( P u O_{2}^{2+} ) in strongly acidic solution B. Maximum oxidation state of Np is +7 ( mathrm{C} cdot U mathrm{O}_{2}^{2+} ) is stable D. All of the above are correct statement |
12 |
| 875 | Nonstoichiometry is shown A. due to variable valency of transition elements B. due to to defects in solid structures C. due to both (a) and (b) D. due to none of the above |
12 |
| 876 | Which of the following statements is not correct regarding Lanthanoids and Actinoids? A. Oxidation state +3 is predominant in both theseries. B. In both the series f-orbitals are being progressively filled C. the elements of both the series are radioactive D. Both series show contraction as Lanthanide contraction and actinide contraction. |
12 |
| 877 | ( V^{3+} ) is coloured If the given statement is true enter 1 else enter 0 |
12 |
| 878 | Which of the following is false? This question has multiple correct options ( mathbf{A} cdot C r^{2+}(g) ) ion has greater magnetic moment compared to ( C o^{3+}(g) ) B. The magnitude of ionization potential of iron an-ion (monoanion) would be equal to electron gain enthalpy of iron. C. Lanthanoids contraction is cause of lower I.P of ( P b ) than ( S n ) D. If successive ionization energy are ( 332,738,849,4080,4958 text { (in } k J / m o l) ). Then this element can be of 15 th group. |
12 |
| 879 | Identify the order in which the spin only magnetic moment (in BM) increases for the following four ions: (।) ( boldsymbol{F} boldsymbol{e}^{2+}(|) boldsymbol{T} boldsymbol{i}^{2+}(| boldsymbol{l}) boldsymbol{C} boldsymbol{u}^{2+}(mid V) boldsymbol{V}^{2+} ) A ( . I, I I, I V, I I I ) в. ( I V, I, I I, I I I ) с. ( I I I, I V, I, I I ) D. III, II, IV, |
12 |
| 880 | The oxidation states of central metal ions of ( (A),(B) ) and ( (C) ) compounds are respectively: A. ( +11,+ ) VI and ( + ) VII B. ( +11,+ ) VI and ( +v ) I c. ( +1 !,+ ) VII and ( + ) vII D. ( +mathrm{Vl} ), ( + ) VII and ( +mathrm{V} ) I |
12 |
| 881 | An inorganic salt is lemon yellow in colour. It becomes orange in colour like methyl orange when it is acidic and again becomes yellow when it is alkaline. The inorganic salt will be : A. copper nitrate B. ferric chloride c. potassium chromate D. potassium ferricyanide |
12 |
| 882 | Atomic number 64 will have electronic configuration: ( mathbf{A} cdot[X e]_{54} 6 s^{2} 4 f^{3} ) В ( cdot[X e]_{54} 6 s^{2} 4 f^{7} 5 d^{1} ) ( mathbf{c} cdot[X e]_{54} 4 f^{10} ) ( mathbf{D} cdot[X e]_{54} 6 s^{2} 4 f^{7} 5 p^{1} ) |
12 |
| 883 | Copper becomes green when exposed to moist air for a long period of time due to the A. formation of a layer of cupric oxide on the surface of copper. B. formation of a layer of basic carbonate of copper on the surface of copper c. formation of a layer of cupric hydroxide on the surface of copper. D. none of the above |
12 |
| 884 | a. Why 3 d-series of elements acts as good catalyst? b. Given reason: ( boldsymbol{T} boldsymbol{i}^{4+} ) salts are colourless where as ( C r^{3+} ) salts are coloured. |
12 |
| 885 | Which sub shell is filled up progressively in actinoids? ( A cdot 4 f ) B. 5f ( c cdot 6 d ) D. 7s |
12 |
| 886 | Lanthanides are also known as: A. Transition elements B. Rare gases c. coinage metals D. Rare earths |
12 |
| 887 | The pair of compounds that can exist together is: ( mathbf{A} cdot F e C l_{3}, S n C l_{2} ) ( mathbf{B} cdot H g C l_{2}, S n C l_{2} ) ( mathbf{c} cdot F e C l_{2}, S n C l_{2} ) ( mathbf{D} cdot F e C l_{3}, K I ) |
12 |
| 888 | Write balanced chemical equations for the following reactions: Oxalic acid is treated with acidified potassium permanganate solution |
12 |
| 889 | If the following ion is coloured enter 1 else enter 0 ( N i^{2+} ) |
12 |
| 890 | The incorrect configuration is: A. ( K=[A r] 4 s^{1} ) B. ( C r=[A r] 3 d^{5}, 4 s^{1} ) c. ( C r=[A r] 3 d^{4}, 4 s^{2} ) D. ( C u=[A r] 3 d^{10}, 4 s^{1} ) |
12 |
| 891 | Which of the following statement is not correct? A. Fe, Ni, Co form interstetial compound в. ( C u S O_{4}+C a(O H)_{2} ) is called Bordeaux mixture c. verdigris is basic copper acetate ( left[C uleft(C O O C H_{3}right)_{2} C u(O H)_{2}right] ) D. 24 carat gold is an alloy of Au and cu |
12 |
| 892 | The +3 ion of which one of the following has half filled ( 4 f ) subshell: A . ( L a ) в. ( L u ) ( c . G d ) D. ( A c ) |
12 |
| 893 | ( boldsymbol{S} boldsymbol{c}^{boldsymbol{3}+} ) is colorless. If the given statement is true enter 1 else enter 0 |
12 |
| 894 | More number of oxidation states are exhibited by the actinoids than by lanthanoids. The main reason for this is: A. greater metallic character of the lanthanoids than that of the corresponding actinoids. B. more active nature of the actinoids c. more energy difference ( 5 f ) and ( 6 d ) -orbitals than that between ( 4 f ) and ( 5 d ) -orbitals D. lesser energy difference between ( 5 f ) and ( 6 d ) -orbitals than that between ( 4 f ) and ( 5 d ) -orbitals |
12 |
| 895 | Which of the following electronic configuration is associated with the highest stable oxidation state? ( mathbf{A} cdot[A r] 3 d^{1} 4 s^{2} ) B cdot ( [A r] 3 d^{5} 4 s^{1} ) ( mathbf{c} cdot[A r] 3 d^{5} 4 s^{2} ) D cdot ( [A r] 3 d^{6} 4 s^{2} ) |
12 |
| 896 | Which of the following statement(s) is/are not correct? ( mathbf{A} cdot L a(O H)_{3} ) is less basic than ( L u(O H)_{3} ) B. In lanthanide series, ionic radius of ( L n^{3+} ) ion decreases. C. ( L a ) is actually an element of transition series rather than lanthanides. D. Atomic radii of ( Z r ) and ( H f ) are same because of lanthanide contraction. |
12 |
| 897 | ( ln left[boldsymbol{F e}(boldsymbol{C N})_{5}left(boldsymbol{N O}^{+}right)right]^{2-}, ) Fe has +3 state It can be decided by: A. magnetic measurement B. colligative property c. colour D. hybridisation |
12 |
| 898 | Which is the strongest base among the following? ( mathbf{A} cdot L a(O H)_{3} ) В. ( L u(O H)_{3} ) ( mathbf{c} cdot operatorname{Ce}(O H)_{3} ) D. ( Y b(O H)_{3} ) |
12 |
| 899 | Which of the following can convert acidified ( C r_{2} O_{7}^{2-} ) to green product? ( mathbf{A} cdot S O_{2}, H_{2} S O_{3} ) and ( H_{2} S O_{4} ) B. ( S O_{2}, H_{2} S ) and ( H_{2} S O_{3} ) ( mathbf{c} cdot S O_{3}, H_{2} S ) and ( F e^{3+} ) D. ( S O_{3}^{-}, H_{2} S ) and ( F e^{+2} ) |
12 |
| 900 | Which of the following ions has same number of unpaired electrons as those present in ( V^{3+} ) ion? A ( cdot F e^{3} ) B. ( N i^{2} ) c. ( M n^{2} ) D. ( C r^{3} ) |
12 |
| 901 | Compare the chemistry of actinoids with that of the lanthanoids with special reference to: (i) electronic configuration (ii) atomic and ionic sizes and (iii) oxidation state (iv) chemical reactivity. |
12 |
| 902 | What changes occur when acidified ( C r_{2} O_{7}^{2-} ) ion reacts with ( H_{2} O_{2} ) solution in presence of ether solvent? A. orange colour of solution turns blue B. Oxidation state of ( C r ) atom increases c. oxidation state of ( C r ) atom remains constant D. Orange colour turns green |
12 |
| 903 | 0.59 Assertion (A) Cu + iodide is not known. Reason (R) Cuc* oxidises I to jodine. |
12 |
| 904 | Elements having atomic number higher than ( ^{prime} mathbf{9} 2^{prime} ) in the periodic table are known as: A. transuranic elements B. rare earth elements c. transitional elements D. alkaline earth metals |
12 |
| 905 | Which of the following is not an actinoid? A. Curium (Z = 96) B. Californium (Z = 98) c. Uranium ( ( z=92 ) ) D. Terbium (Z = 65) |
12 |
| 906 | Iron exhibits +2 and +3 oxidation states Which of the following statements about iron is incorrect? A. Ferrous oxide is more basic in nature than the ferric oxide B. Ferous compounds are relatively more ionic than the corresponding ferric compounds c. Ferrous compounds are less volatile than the corresponding ferric compounds D. Ferrous compounds are more easily hydrolysed than the corresponding ferric compounds |
12 |
| 907 | What is the correct order of covalent size of the following? ( mathrm{Cu} ) A ( . mathrm{Cu}=mathrm{Ni} ) B. cusNi ( c cdot c u>N i ) D. None of these |
12 |
| 908 | Which of the following elements belongs to actinide series? A . Lu B. Gd c. Th D. La |
12 |
| 909 | The magnetic moment of a transition metal of ( 3 d ) -series is ( 6.92 B M . ) Its electronic configuration will be: A ( cdot(3 d)^{4}(4 s)^{2} ) B ( cdot(3 d)^{5}(4 s)^{1} ) ( c cdot(3 d)^{10} ) D. ( (3 d)^{5}(4 s)^{0} ) |
12 |
| 910 | Which of the following arrangements does not represent the correct order of the property stated against it? A ( cdot V^{2+}<C r^{2+}<M n^{2+}<F e^{2+}: ) Paramagnetic behavior B. ( N i^{2+}<C o^{2+}<F e^{2+}<M n^{2+}: ) lonic size C. ( C o^{3+}<F e^{3+}<C r^{3+}<S c^{3+}: ) Stability in aqueous solution D. ( S c<T i<C r<M n ) : Number of oxidation states |
12 |
| 911 | 42. Which one of the following is not a characteristic feature of alloys ? They are (1) Compounds (2) Mixtures (3) Solutions (4) Homogeneous systems |
12 |
| 912 | ( M n O_{4}^{2-}(1 text { mole }) ) in neutral aqueous medium is disproportionate to: A ( cdot 2 / 3 ) mole of ( M n O_{4}^{-} ) and ( 1 / 3 ) mole of ( M n O_{2} ) B . 1/3 mole of ( M n O_{4}^{-} ) and 2/3 mole of ( M n O_{2} ) c. ( 1 / 3 ) mole of ( M n_{2} O_{7} ) and ( 1 / 3 ) mole of ( M n O_{2} ) D. 2/3 mole of ( M n_{2} O_{7} ) and ( 1 / 3 ) mole of ( M n O_{2} ) |
12 |
| 913 | Question 19. Compare the stability of +2 oxidation state for the elements of the first transition series. Write the valence shell electronic configuration of first transition series for M2+. Compare the stability on the basis of half-filled and completely filled d-orbitals. |
12 |
| 914 | The trend of basicity of lanthanoid hydroxides: A. increases across the lanthanoid series B. decreases across the lanthanoid series C. first increases and then decreases D. first decreases and then increases |
12 |
| 915 | The color of ( C o C l_{3} .5 N H_{3} . H_{2} O ) is: A . red B. orange c. orange-yellow D. pink |
12 |
| 916 | Which of the following is most stable ( operatorname{among} boldsymbol{C u}^{+}, boldsymbol{F e}^{+}, boldsymbol{F e}^{2+}, boldsymbol{a n d} boldsymbol{F e}^{3+} ) A ( cdot C u^{+} ) B. ( F e^{+} ) ( mathrm{c} cdot F e^{2} ) D. ( F e^{3} ) |
12 |
| 917 | Question 25. Give examples and suggest reasons for the following features of the transition metal chemistry. 6) The lowest oxide of transition metal is basic, the highest amphoteric/acidic. (ii) A transition metal exhibits highest oxidation state in oxides and fluorides. Gin) The highest oxidation state is exhibited in oxoanions of a metal. |
12 |
| 918 | Identify a ‘chemical twin’ among the following. A. Zr-Ta B. Nb-Tc c. Hf-Re D. Nb-Ta |
12 |
| 919 | ( K_{2} C r_{2} O_{7} ) react with hydrazine to form product. The oxidation state of ( C r ) in the product will be: ( A cdot+4 ) B. +3 ( c .+5 ) D. +2 |
12 |
| 920 | The number of unpaired electrons in ferrous ion is: ( A cdot 2 ) B. 3 ( c cdot 4 ) D. |
12 |
| 921 | The most common oxidation state of Lanthanoids is: ( A cdot+4 ) ( B cdot+3 ) ( c cdot+6 ) ( D cdot+2 ) |
12 |
| 922 | How is ( C l_{2} ) prepared using ( K M n O_{4} ) | 12 |
| 923 | If ( C O_{2} ) is passed into waste water containing ( C r O_{7}^{2-} ) (yellow) then: A. Solution turns green due to formation of ( C r^{3} ) B. Solution turns blue due to formation of ( C r O_{5} ) C. Solution turns orange due to formation of ( C r_{2} O_{7}^{2} ) D. No effect takes place |
12 |
| 924 | A metal ( M ) which is not affected by strong acids like conc. ( H N O_{3}, ) conc. ( H_{2} S O_{4} ) and conc. solution of alkalies like ( N a O H, K O H ) forms ( M C l_{3} ) which finds use for toning in photography. The metal ( M ) is : A . ( A g ) в. ( H g ) c. ( A u ) D. ( C u ) |
12 |
| 925 | What may be the stable oxidation state of the transition element with the following d-electron configuration in the ground state of their atoms: ( 3 d^{3}, 3 d^{5}, 3 d^{8} ) and ( 3 d^{4} ? ) |
12 |
| 926 | Question 15. Describe the oxidising action of potassium dichromate and write the ionic equations for its reaction with (1) iodide (ii) iron (II) solution (iii) HZS Potassium dichromate being a strong oxidising agent, oxidises (1) into In. (ii) Fe 2+ into Fe 3+ and (iii) H.S into S and itself gets reduced to Crs+. |
12 |
| 927 | Explain why iron, cobalt, nickel do not show the expected highest oxidation states of +8,+9 and +10 respectively? | 12 |
| 928 | Question 30. Which is the last element in the series of the actinoids? Write the electronic configuration of this element. Comment on the possible oxidation state of this element. Actinoids = 8gAc to 109LF. |
12 |
| 929 | Which of the following is not a member of 3d-transition series? ( A cdot F e ) B. co c. Au D. cu |
12 |
| 930 | Assertion HCl doesn’t used to acidify a ( K M n O_{4} ) solutions in volumetric estimations of ( boldsymbol{F} boldsymbol{e}^{2+} ) or ( boldsymbol{C}_{2} boldsymbol{O}_{4}^{2-} ) Reason ( K M n O_{4} ) oxidizes HCl to ( C l_{2} ) 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 |
12 |
| 931 | Lanthanoids contraction is due to increase in: A. shielding by ( f ) -electrons B. atomic number. c. effective nuclear charge D. size of 4 f-orbital. |
12 |
| 932 | Which of the following factors may be regarded as the main cause of lanthanide contraction? A. Poor shielding of one of ( 4 f ) electron by another in the subshell B. Effective shielding of one of 4 f electrons by another in the subshell C. Poorer shielding of 5d electrons by 4f electrons D. Greater shielding of 5d electrons by 4f electrons |
12 |
| 933 | Which subshell is filled up progressively in actinides? A . ( 4 f ) B. ( 5 f ) c. ( 6 d ) D. ( 7 s ) |
12 |
| 934 | The electronic configuration of ( boldsymbol{E} boldsymbol{u} ) (Atomic No. 63 ), ( G d ) (Atomic No. 64 ) and Tb (Atomic No. 65 ) are : A ( cdot[X e] 4 f^{7} 6 s^{2},[X e] 4 f^{8} 6 s^{2} ) and ( [X e] 4 f^{8} s d^{1} 6 s^{2} ) B . ( [X e] 4 f^{7} 5 d^{1} 6 s^{2},[X e] 4 f^{7} 5 d^{1} 6 s^{2} ) and ( [X e] 4 f^{9} 6 s^{2} ) C ( cdot[X e] 4 f^{6} 5 d^{1} 6 s^{2},[X e] 4 f^{7} 5 d^{1} 6 s^{2} ) and ( [X e] 4 f^{8} 5 d^{1} 6 s^{2} ) D cdot ( [X e] 4 f^{7} 6 s^{2},[X e] 4 f^{7} 5 d^{1} 6 s^{2} ) and ( [X e] 4 f^{9} 6 s^{2} ) |
12 |
| 935 | Write the electronic configurations of the elements with the atomic numbers ( 61,91,101, ) and 109 |
12 |
| 936 | Which of the following statement concerning Lanthanoid is incorrect? A. All Lanthanoids are highly dense metals. B. Most characteristic oxidation state of Lanthanide elements is +3. C. The ionic radii of trivalent Lanthanides steadily increase with increase in the atomic number D. Lanthanoids are separated from one another by ion exchange methods |
12 |
| 937 | The basic character of the transition metal monoxides follows the order: (Atomic number ( mathrm{Ti}=22, mathrm{V}=23, mathrm{Cr}=24 ) ( F e=26) ) A. TiO > Fe0 > VO > cro в. тio > vo > cro > Feo c. тio ( > ) Cro ( > ) vo ( > ) Feo D. crosvo ( > ) Fe0 > Tio |
12 |
| 938 | Select incorrect statement(s). A. Ionisation energies of 5d-elements are greater than those of ( 3 d ) and ( 4 d ) elements B. Cu(l) is diamagnetic while Cu(II) is paramagnetic ( mathbf{c} cdotleft[T ileft(H_{2} Oright)_{6}right]^{3+} ) is coloured while ( left[S cleft(H_{2} Oright)_{6}right]^{3+} ) colourless D. Transition elements cannot form complexes |
12 |
| 939 | Which of the following Actinoid cannot have an electron in 5f-orbital? A. Uranium B. Thorium c. Plutonium D. Nobelium |
12 |
| 940 | The equivalent weight of ( M n O_{2} ) is equal to its molecular weight when it is converted to: ( mathbf{A} cdot M n_{2} O_{3} ) B. ( M n O ) c. ( M n O_{4}^{2} ) D. ( M n O_{4}^{-} ) |
12 |
| 941 | 0. 29 Transition elements form binary compou insition elements form binary compounds with halogens. Which of the following elements will form MF, type compounds? (a) Cr (b) Co (c) Cu (d) Ni |
12 |
| 942 | When ( M n O_{2} ) is fused with ( mathrm{KOH} ) and ( O_{2} ) what is the product formed and its colour? A. Mno – colourless B . ( K M n O_{4} ) – purple C. ( K_{2} M n O_{4} ) – dark green D. ( M n O_{3} ) – black |
12 |
| 943 | nyarog C WUCIT UN CICLOU POCITUV.UU. Question 2. Why E° values of Mn, Ni, Zn are more negative than expected? 2+ 2+ . : 13f |
12 |
| 944 | Name two metals that do not react with water at all. |
12 |
| 945 | The electronic configuration of Gd (atomic number ( =mathbf{6 4} ) amu) is: ( mathbf{A} cdot[X e] 4 f^{8} 5 d^{9} 6 s^{2} ) в. ( [X e] 4 f^{7} 5 d^{1} 6 s^{2} ) ( mathbf{c} cdot[X e] 4 f^{5} 5 d^{2} 6 s^{2} ) ( mathbf{D} cdot[X e] 4 f^{3} 5 d^{3} 6 s^{2} ) |
12 |
| 946 | Fe is made passive by: A ( cdot d i l . H_{2} S O_{4} ) в. dil. ( H C l ) c. ( a q u a-r e )eja ( a ) D. conc.H( _{2} ) SO ( _{4} ), |
12 |
| 947 | The electronic configuration of ( _{59} P r ) (Praseodymium) is? A ( cdotleft[_{54} X eright] 4 f^{2} 5 d^{1} 6 s^{2} ) B . ( left[_{54} X eright] 4 f^{1} 5 d^{2} 6 s^{2} ) c. ( left[_{54} X eright] 4 f^{3} 6 s^{2} ) D・ ( left[_{54} X eright] 4 f^{3} 5 d^{2} ) |
12 |
| 948 | Which is more stable in the below given pair? ( V^{2+}– ) ( boldsymbol{V} boldsymbol{O}_{4}^{3-} ) A ( cdot V^{2+}=V O_{4}^{3-} ) B . ( V^{2+}V O_{4}^{3-} ) D. None of these |
12 |
| 949 | The radius of ( L a^{3+} ) (Atomic number of ( boldsymbol{L} boldsymbol{a}=mathbf{5} mathbf{7}) ) is ( mathbf{1 . 0 6} boldsymbol{A} ) Which one of the following given values will be closest to the radius of ( L u^{3+} ) (Atomic number of ( boldsymbol{L} boldsymbol{u}=mathbf{7} 1) ? ) A ( .40 A ) в. ( 1.06 A ) c. 0.85 D. ( 1.60 A ) |
12 |
| 950 | Which of the following factors may be regarded as the main cause of lanthanide contraction? A. Greater shielding of 5 d-electron by 4 f-electrons B. Poor shielding of 5 d-electron by 4 f-electrons c. Effective shielding of one 4 f-electrons by another in the subshel D. Poor shielding of one of 4-electrons by another in the subshell |
12 |
| 951 | Actinides have higher tendency to form complexes than Lanthanides, due to A. Higher charge and smaller size B. Smaller charge and larger size c. They are radioactive D. They are electropositive |
12 |
| 952 | In which of the following compounds iron has the lowest oxidation state? ( mathbf{A} cdot F e(C O)_{5} ) ( mathbf{B} cdot F e_{2} O ) ( mathbf{c} cdot K_{4}left[F e(C N)_{6}right] ) D ( cdot F e S O_{4} cdotleft(N H_{4}right) S O_{4} cdot 6 H_{2} O ) |
12 |
| 953 | Give the electron configuration of the given metal (atom/ions) ( F e O_{4}^{2-}(text { ferrate ion }) ) ( mathbf{A} cdot[A r] 3 s^{2} ) B . ( [A r] 4 s^{2} ) c. ( [A r] 3 d^{2} ) D. none of these |
12 |
| 954 | A hydrated colorless solid (A) is water soluble and finds use in medicine as a purgative. When a solution of (A) is treated with ammonium phosphate, a white precipitate is formed. (A) gives a pink mass in cobalt nitrate cavity test What is ( (A) ? ) A ( . F e S O_{4} .7 H_{2} ) в. ( N a_{2} S O_{4} .10 H_{2} ) c. ( M g S O_{4} .7 H_{2} O ) D. ( operatorname{CaSO}_{4} .2 mathrm{H}_{2} ) |
12 |
| 955 | Variable valency of transition elements is on account of : A. incomplete s – orbitals B. incomplete d – orbitals C . completely filled d- orbitals D. incomplete p-orbitals |
12 |
| 956 | The atomic and ionic radii ( left(mathrm{M}^{3+} ) ions) of right. Lanthanide elements decrease with increase in atomic number. This effect is called: A. Lanthanoid contraction B. f-fransition c. Actinoid contraction D. shielding effect |
12 |
| 957 | Which of the following has pseudo-inert gas configuration in the ( (n-1) ) shell? A. Typical transition elements B. Zinc group elements c. Both of the above D. None of the above |
12 |
| 958 | A transition metal x has the electronic configuration [Ar]3d ( ^{4} ) in its +3 oxidation state. The element is: A. Mn B. Fe c. Ti D. |
12 |
| 959 | The maximum oxidation state exhibited by actinide ions is: ( A cdot+5 ) B. +4 ( c cdot+7 ) D. +8 |
12 |
| 960 | The position in the periodic table to which the lanthanides and actinides metals belong: A. alkali metals B. alkaline earth metals c. transition elements D. inner transition elements |
12 |
| 961 | The following belongs to d-block but it is not transition element A. Mn B. Fe ( c cdot z n ) D. cr |
12 |
| 962 | Describe the structure of interstitial and substitutional alloys and outline the factor determining which is formed. |
12 |
| 963 | The outer shell electronic configuration of ( G d(Z=64) ) is A ( cdot 4 f^{7} 5 d^{1} 6 s^{2} ) B ( cdot 4 f^{8} 6 s^{2} ) c. ( 4 f^{9} 9 s^{text {। }} ) D. ( 4 f^{7} 5 d^{2} 6 s^{1} ) |
12 |
| 964 | Which is the last element in the series of the actinoids? Write the electronic configuration of this element. Comment on the possible oxidation state of this element |
12 |
| 965 | (i) Why do transition elements show variable oxidation states? (ii) Name the element showing maximum number of oxidation states among the first series of transition metals from ( boldsymbol{S} boldsymbol{c}(boldsymbol{Z}=boldsymbol{2} mathbf{1}) ) to ( boldsymbol{Z} boldsymbol{n}(boldsymbol{Z}=boldsymbol{3} boldsymbol{0}) ) (iii) Name the element which shows only +3 oxidation state (iv) What is lanthanoid contraction? Name an important alloy which contains some of the lanthanoid metals |
12 |
| 966 | Which of the following lanthanides have no partially filled ( 4 f ) sub-shell but have electrons in ( 5 d ) sub-shell ? A ( . C e ) в. ( L u ) c. ( P m ) D. ( N d ) |
12 |
| 967 | ( C r_{2} O_{7}^{2-p H>a} C r O_{4}^{2-p H leqslant b} C r_{2} O_{7}^{2-} ) Find the value of ( frac{boldsymbol{a}}{boldsymbol{b}}: ) |
12 |
| 968 | Number of ( C r-O ) bonds in dichromate ( operatorname{ion}left(C r_{2} O_{7}^{2-}right) ) is: ( A cdot 6 ) B. 7 ( c cdot 8 ) D. 4 |
12 |
| 969 | The extent of actinoid contraction is greater than lanthanoid contraction explain |
12 |
| 970 | Which one of the following elements forms compounds that are all coloured? A. Magnesium B. Aluminium c. Iron D. Chromium |
12 |
| 971 | ( G d(64) ) has unpaired electrons with sum of spin ( mathbf{A} cdot 7,3.5 ) в. 8,3 ( c .6,3 ) D. 8,4 E . 9,3.5 |
12 |
| 972 | Least paramagnetic property is shown by: A . ( F e ) в. ( M n ) c. ( N i ) D. ( C u ) |
12 |
| 973 | Which of the following represents the electronic configuration of a transition elements? A ( cdot 1 s^{2}, 2 s^{2} p^{6} dots . . n s^{2} p^{3} ) B . ( 1 s^{2}, 2 s^{2} p^{6} ldots . . n s^{2} p^{6} d^{3},(n+1) s^{2} ) C ( cdot 1 s^{2}, 2 s^{2} p^{6} ldots n s^{2} p^{6} d^{10},(n+1) s^{2} p^{1} ) D. ( 1 s^{2}, 2 s^{2} p^{6} ldots . n s^{2} p^{6} ) |
12 |
| 974 | In aqueous solution ( mathrm{Eu}^{2+} ) acts as : A . an oxidsing agent B. reducing agent C. can act as either of these D. can not act as either of these |
12 |
| 975 | What are alloys? Name an important alloy which contains some of the lanthanoid metals. Mention its uses. |
12 |
| 976 | Match list-I with list -II. List I (A) Lanthanide contraction ( (p) d ) block (B) Diagonal relationship Elements of 3rd period (C) Typical elements ( (r) ) block (D) Inner transition elements ( mathrm{Be}-mathrm{A} ) ( A cdot A-r, B-s, C-q, D-r ) B. A-p,B -r,C – s, D-q ( c cdot A-s, B-q, c-p, D-r ) D. A – q, B – p, C – r, D- – |
12 |
| 977 | Regarding the magnetic properties of lanthanides and actinides the correct statement is: A. Lanthanides are weakly paramagnetic while actinides are strongly paramagnetic B. Quenching of orbital contribution is greater in lanthanides than in actinides C. ( 5 f ) electrons in actinides are too diffuse and are less effectively shielded which results in considerable quenching of orbital contribution, and hence the magnetic moments of actinides are significantly less than theoretically predicted values D. Because of diffused f electrons there is no quenching of orbital contribution towards magnetic moment |
12 |
| 978 | What are inner transition elements? Decide which of the following atomic numbers are the atomic numbers of the inner transition elements : ( mathbf{2 9}, mathbf{5 9}, mathbf{7 4}, mathbf{9 5}, mathbf{1 0 2}, mathbf{1 0 4} ) |
12 |
| 979 | Question 12. A solution of KMnO4 on reduction yields either a colourless solution or a brown precipitate or a green solution depending on pH of the solution. What different stages of the reduction do these represent and how are they carried out? Qu |
12 |
| 980 | Consider the following statements in respect of lanthanoids. 1. The basic strength of hydroxides of lanthanoids increases from ( mathrm{La}(O H)_{3} ) to ( boldsymbol{L} boldsymbol{u}(boldsymbol{O} boldsymbol{H})_{4} ) 2. The lanthanoid ions ( boldsymbol{L} boldsymbol{u}^{3+}, boldsymbol{Y} boldsymbol{b} boldsymbol{6} boldsymbol{2}+, boldsymbol{C} boldsymbol{e}^{4+} ) are diamagnetic. Which of the statement(s) given above is are correct? A. Only 1 B. Only 2 c. Both 1 and 2 D. Neither 1 nor 2 |
12 |
| 981 | The property seen in f-block elements is: A. Lanthanide contraction B. actinide contraction ( c . ) both ( (A) ) and ( (B) ) D. none of these |
12 |
| 982 | The colour of ( _{62} S m^{3+} ) is yellow. What is the colour of ( _{66} D y^{3+} ? ) A. Colourless B. Yellow c. Red D. Blue |
12 |
| 983 | The most basic oxide among ( M n O, M n_{2} O_{3}, M n O_{2} ) and ( M n_{2} O_{7} ) is : ( mathbf{A} cdot M n O ) в. ( M n O_{2} ) ( mathrm{c} cdot M n_{2} O_{3} ) D. ( M n_{2} O_{7} ) |
12 |
| 984 | Which of the following is easily oxidized? A. ( N i S O_{4} ) в. ( F e S O_{4} ) ( mathrm{c} cdot mathrm{Fe}_{2}left(mathrm{SO}_{4}right)_{3} ) D. ( S c C l_{3} ) |
12 |
| 985 | The correct order of ionic radii of ( boldsymbol{Y} boldsymbol{b}^{3+}, boldsymbol{L} boldsymbol{a}^{3+}, boldsymbol{E} boldsymbol{u}^{3+} ) and ( boldsymbol{L} boldsymbol{u}^{3+} ) is: ( mathbf{A} cdot Y b^{3+}>L u^{3+}>E u^{3+}>L a^{3+} ) B. ( L u^{3+}<Y b^{3+}<E u^{3+}<L a^{3+} ) c. ( L u^{3+}<E u^{3+}<L a^{3+}<Y b^{3+} ) D. ( L a^{3+}<E u^{3+}<L u^{3+}<Y b^{3+} ) |
12 |
| 986 | Assertion Transition metals are efficient catalysts. Reason Transition metals usually contain incomplete d-orbitals and provide larger surface area for adsorption. 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 |
12 |
| 987 | The most common oxidation state of lanthanides is: ( A cdot+2 ) B. +3 ( c cdot+4 ) D. +5 |
12 |
| 988 | Give the electron configuration of the given metal (atom/ions) ( M n O_{2} ) A ( cdot[A r] 3 s^{2} 3 p^{1} ) B ( cdot[A r] 3 d^{1} 4 s^{2} ) c. ( [A r] 3 d^{3} ) D. None of these |
12 |
| 989 | The color of ( K M n O_{4} ) is due to: A . L-> M charge transfer transition B . ( sigma-sigma^{*} ) transition c. M-> L charge transfer transition D. d-d transition |
12 |
| 990 | (a) Complete the following equations: (i) ( C r_{2} O_{7}^{2-}+2 O H^{-} rightarrow ) ( M n O_{4}^{-}+4 H^{+}+3 e^{-} rightarrow ) (b) Account for the following: (i) ( Z n ) is not considered as a transition element. (ii) Transition metals form a larger number of complexes. (iii) The ( E^{0} ) value for the ( M n^{3+} / M n^{2+} ) couple is much more positive than that for ( boldsymbol{C r}^{3+} / boldsymbol{C r}^{2+} ) couple. |
12 |
| 991 | 5th period element with no electrons in 5th orbit is: A. Pd B. Pt c. ( mathrm{Ni} ) D. zn |
12 |
| 992 | Question 11. Although +3 oxidation state is the characteristic oxidation state of lanthanoids but cerium shows +4 oxidation state also. Why? Solution |
12 |
| 993 | What is spitting of silver? How can it be prevented? |
12 |
| 994 | Q.52 Match the catalysts given in Column I with the processes given in Column II. 1 A B. C D. Column 1 (Catalyst) Ni in the presence of hydrogen CUCI, vos Finely divided iron TICIA + Al(CH), Column II (Process) Ziegler-Natta catalyst Contact process Vegetable oil to ghee Sandmeyer reaction Haber’s process Decomposition of KCIO 3. 4. 5. 6. E |
12 |
| 995 | Assertion The highest oxidation state of ( O s ) is +8 Reason Osmium is a 5 d-block element. Read the above assertion and reason and choose the correct option from the following. 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 |
12 |
| 996 | Non-Lanthanoid element is: A . La B . Lu ( c cdot P r ) D. Pm |
12 |
| 997 | The correct statement for ( d ) -block element is: This question has multiple correct options |
12 |
| 998 | Which shells are called penultimate and prepenultimate shells? | 12 |
| 999 | 47. Which one of the following does not contain Silver ? (1) Ruby Silver (2) Lunar Caustic (3) German Silver (4) Horn Silver |
12 |
| 1000 | 7. Baeyer’s reagent is (a) alkaline permanganate solution (b) acidified permanganate solution (c) neutral permanganate solution (d) aqueous bromine solution (IIT-JE |
12 |
| 1001 | 17. K,Cr, O, is an oxidizing agent in acidic medium. How many O-atoms are directly linked to each Cr-atom? |
12 |
| 1002 | The approximate size of the nucleus of ( 64 N i ) is: ( : 88^{text {. }} ) : ( A cdot 3 ) fm B. 4 fm c. 5 fm ( D cdot 2 mathrm{fm} ) |
12 |
| 1003 | Brown glass and cement have, which element common in them: A . ( F e ) в. ( A l ) ( c . N a ) D. all of these |
12 |
| 1004 | The colour of Lanthanoids and Actinoids is due to: A. s-ftransitions B. p-f transitions c. d-f transitions D. f-f transitions |
12 |
| 1005 | How many of the following ions have the same magnetic moments? ( mathrm{Fe}^{2+} mathrm{Mn}^{2+} mathrm{Cr}^{2+} mathrm{Ni}^{2+} ) A B. 2 ( c cdot 3 ) D. 4 |
12 |
| 1006 | Complete the given reaction. ( 2 M n^{2+}+5_{–}(i)_{–}+8 H_{2} O rightarrow 2_{–} ) ( (i i)_{–}+16 H^{+} ) ( (i i)_{–}+10_{–} ) A ( cdot(i)-S O_{4}^{2-},(i i)-M n O_{4}^{-},(i i i)-S_{2} O_{8}^{2-} ) B . ( (i)-S_{2} O_{8}^{2-},(i i)-M n O_{4}^{-},(i i i)-S_{2} O_{4}^{2} ) C ( cdot(i)-M n O_{4}^{-},(i i)-S_{2} O_{8}^{2-},(i i)-S O_{4}^{2} ) D ( cdot(i)-S_{2} O_{8}^{2-},(i i)-S O_{4}^{2-},(i i i)-M n O_{4} ) |
12 |
| 1007 | Which of the following statements regarding Lanthanides is false? A. All lanethanides are solid at room temperature B. Their usual oxidation state is +3 C. They can be separated from one another by ionexchange method D. lonic radii of trivalent lanthanides steadily increases with increase in atomic number |
12 |
| 1008 | Show with balanced equations what happens when the following are mixed: Aqueous solution of potassium chromate and acid. A ( cdot 2 C r O_{4}^{2-}+2 H^{+} rightleftharpoons C r_{2} O_{7}^{2-}+H_{2} O ) B ( cdot 2 C r O_{4}^{2-}+10 H^{+} rightleftharpoons C r_{2} O_{3}^{2-}+5 H_{2} O ) ( mathrm{c} cdot 2 mathrm{Cr} mathrm{O}_{4}^{2-}+6 mathrm{H}^{+} rightleftharpoons mathrm{Cr}_{2} mathrm{O}_{5}^{2-}+3 mathrm{H}_{2} mathrm{O} ) D. None of these |
12 |
| 1009 | Which of the following statements is incorrect? A. Transition elements exhibit higher enthalpies of atomization as they have stronger interatomic interaction B. Second ionisation energy of ( _{23} V_{25} M n ) and ( _{28} N i_{30} Z n ) C ( . N i(I I) ) compounds are more stable than ( P t(I I) ) whereas ( P t(I V) ) compounds are more stable than nickel ( (I V) ) D. The elements which give the greatest number of oxidation states do not occur in or near the middle of the series |
12 |
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