9724219216

DEV Institute, Gandhinagar

Chapter : 4 Std 12 : Chemistry Date : 08/02/25
Total Marks : 100 MCQs Practice Time : 1 Hour
//X Section A
• Choose correct answer from the given options. [Each carries 1 Mark] [100]
1. Electronic configuration of a transition element X in (+3) oxidation state is [Ar]3d5. What is its
atomic number ?
(A) 25 (B) 26 (C) 27 (D) 24
2. The electronic configuration of Cu(II) is 3d9 whereas that of Cu(I) is 3d10. 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
3. Metallic radii of some transition elements are given below. Which of these elements will have
highest density ?
Element Fe Co Ni Cu
Metallic radii/pm 126 125 125 128

(A) Fe (B) Ni (C) Co (D) Cu

4. Generally transition elements form coloured salts due to the presence of unpaired electrons. Which
of the following compounds will be coloured in solid state ?
(A) Ag2SO4 (B) CuF2 (C) ZnF2 (D) Cu2Cl2
5. On addition of small amount of KMnO4 to concentrated H2SO4, a green oily compound is obtained
which is highly explosive in nature. Identify the compound from the following.
(A) Mn2O7 (B) MnO2 (C) MnSO4 (D) Mn2O3
6. The magnetic nature of elements depends on the presence of unpaired electrons. Identify the
configuration of transition element, which shows highest magnetic moment.
(A) 3d 7 (B) 3d 5 (C) 3d 8 (D) 3d 2
7. Which of the following oxidation state is common for all lanthanoids ?
(A) +2 (B) +3 (C) +4 (D) +5
8. Which of the following reactions are disproportionation reactions ?
(a) Cu+ ® Cu2+ + Cu
4 + 4H ® 2MnO 4 + MnO2 + 2H2O
(b) MnO2– + –

(c) 2KMnO4 ® K2MnO4 + MnO2 + O2

(d) 2MnO–4 + 3Mn2+ + 2H2O ® 5MnO2 + 4H+
(A) a, b (B) a, b, c (C) b, c, d (D) a, d
9. When KMnO4 solution is added to oxalic acid solution, the decolourization is slow in the beginning
but becomes instantaneous after some time because....
(A) CO2 is formed as the product. (B) Reaction is exothermic.
(C) MnO–4 catalyses the reaction. (D) Mn2+ acts as autocatalyst.
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
11. KMnO4 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 .......... .
2 3 4 1
(A)
5
(B)
5 Wish You - All The
(C)Best
5
(D)
5
 KMnO4 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 .......... . 9724219216
2 3 4 1
(A) (B) (C) (D)
5 5 5 5
12. Which of the following is amphoteric oxide ?
Mn2O7, CrO3, Cr2O3, CrO, V2O5, V2O4
(A) V2O5, Cr2O3 (B) Mn2O7, CrO3 (C) CrO, V2O5 (D) V2O5, V2O4
13. Gadolinium belongs to 4f series. It’s atomic number is 64. Which of the following is the correct
electronic configuration of gadolinium ?
(A) [Xe]4f 7 5d1 6s2 (B) [Xe]4f 6 5d2 6s2 (C) [Xe]4f 8 6d2 (D) [Xe] 4f 9 5s1
14. Interstitial compounds are formed when small atoms are trapped inside the crystal 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) They are chemically very reactive.
15. The magnetic moment is associated with its spin angular momentum and orbital angular
momentum. Spin only magnetic moment value of Cr3+ ion is ............ .
(A) 2.87 BM (B) 3.87 BM (C) 3.47 BM (D) 3.57 BM
16. KMnO4 acts as an oxidising agent in alkaline medium. When alkaline KMnO4 is treated with KI,
iodide ion is oxidised to ........... .
(A) I2 (B) IO– (C) IO–3 (D) IO–4
17. Which of the following statements is not correct ?
(A) Copper liberates hydrogen from acids.
(B) In its higher oxidation states, manganese forms stable compounds with oxygen and fluorine.
(C) Mn3+ and Co3+ are oxidising agents in aqueous solution.
(D) Ti2+ and Cr2+ are reducing agents in aqueous solution.
18. When acidified K2Cr2O7 solution is added to Sn2+ salts then Sn2+ changes to .......... .
(A) Sn (B) Sn3+ (C) Sn4+ (D) Sn+
19. Highest oxidation state of manganese in fluoride is (+4)(MnF4) but highest oxidation state in oxides
is (+7) (Mn2O7) 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.
20. Although Zirconium belongs to 4d transition series and Hafnium to 5d transition series even then
they show similar physical and chemical 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.
21. Why is HCl not used to make the medium acidic in oxidation reactions of KMnO 4 in acidic
medium ?
(A) Both HCl and KMnO4 act as oxidising agents.
(B) KMnO4 oxidises HCl into Cl2 which is also an oxidising agent.
(C) KMnO4 is a weaker oxidising agent than HCl.
(D) KMnO4 acts as a reducing agent in the presence of HCl.
22. ) Which of the following compound is colourless ?
(A) TiO2 (B) TiO (C) Ti2O3 (D) V2O3

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 9724219216
23. ) If “M” is the molecular weight of KMnO4, than what would be the equivalent weight of KMnO4 in
neutral solution ?
M M M
(A) (B) (C) (D) M
5 3 2
24. ) Which of the following metal ion has magenetic moment m = 4.90 BM.
(A) Co2+ (B) V2+ (C) Cu2+ (D) Cr2+
25. ) Which oxidation state is common for lanthanoid elements ?
(A) +4 (B) +3 (C) +2 (D) +5
26. ) Which compound has magnetic moment equal to 4.90 BM ?
(A) FeSO4 (B) NiSO4 (C) MnSO4 (D) Cr2(SO4)3
27. ) Which ion has highest ionisation enthalpy ?
(A) Ti+ (B) V+ (C) Cr+ (D) Mn+
28. ) Which compound's aqueous solution is colourless ?
(A) CuSO4 (B) MnSO4 (C) NiSO4 (D) ZnSO4
29. ) From the following which ion has lowest magnetic moment ?
(A) Ti 3+ (B) Co3+ (C) Cr3+ (D) Fe3+
30. ) Colour of K2MnO4 is ......
(A) violet (B) green (C) blue (D) red
31. ) Which is transition element ?
(A) Zn (B) Cd (C) Hg (D) Cu
32. ) Which of the following compound has the highest magnetic moment ?
(A) MnSO4 (B) Ni(NO3)2 (C) CrCl3 (D) FeSO4
33. ) What is the electronic configuration of Cr ?
(A) [Ar] 3d5 4s1 (B) [Ar] 3d5 4s0 (C) [Ar] 3d4 4s2 (D) [Ar] 3d4 4s0
184) Cu2+ aqueous solution has ......... colour.
34.
(A) Violet (B) Green (C) Blue (D) Yellow
35. ) Highest oxidation state of manganese in fluoride (MnF4) is Mn+4 but highest oxidation state in
oxides (Mn2O7) is Mn+7 because.....
(A) Fluorine is more electronegative than oxygen.
(B) Fluorine does not possess d-orbitals.
(C) In covalent compounds fluorine can form single bond only while oxygen forms double bond.
(D) Fluorine stabilizes lower oxidation state.
36. ) What is the equivalent weight of K2Cr2O7 in acidic medium, if its molecular weight is taken as “M” ?
M M M
(A) M (B) (C) (D)
3 5 6
37. ) Which of the following element having one electron in 5d-orbital in its electronic configuration ?
(A) Pm (B) Tb (C) Nd (D) Gd
38. ) Which of the following is amphoteric oxide ? Mn2O7, CrO3, Cr2O3, CrO, V2O5, V2O4
(A) V2O5, Cr2O3 (B) CrO3, V2O4 (C) Mn2O7, CrO (D) Cr2O3, Mn2O7
39. ) The magnetic moment of a divalent ion in aqueous solution if its atomic number is 25 :
(A) 2.84 BM (B) 5.92 BM (C) 4.90 BM (D) 3.87 BM
40. ) Which are the correct uses of potassium dichromate from the following ?
(i) As an indicator in redox titration
(ii) As a reagent in COD measurement
(iii) As reducing agent in synthesis of organic compounds
(iv) In leather industry
(A) (i) (B) (ii) and (iv) (C) (i) and (iii) (D) (i), (ii) and (iii)
41. ) Assertion [A] : Atomic radii from Cr to Cu is almost similar.
Reason [R] : Sheilding effect of entering electron in 3d-orbital decrease repulsion forces of 4s-orbital
electrons towards nucleus. Wish You - All The Best
(A) [A] and [R] both are true, [R] is correct explanation of [A].
 ) Assertion [A] : Atomic radii from Cr to Cu is almost similar. 9724219216
Reason [R] : Sheilding effect of entering electron in 3d-orbital decrease repulsion forces of 4s-orbital
electrons towards nucleus.
(A) [A] and [R] both are true, [R] is correct explanation of [A].
(B) [A] is true, [R] is wrong.
(C) [A] and [R] both are true.
(D) [A] is wrong, [R] is true.
42. ) What is the magnetic momentum of cuprous chloride on the basis of the axial rotation ?
(A) 1.73 BM (B) 4.90 BM (C) 0.0 BM (D) 2.83 BM
43. ) Which of the following statements is incorrect ?
(A) The ionic size decreases as we move from Ce3+ to Lu3+
(B) The atomic radius decreases as we move from Ce to Lu
(C) Ce(OH)3 is the least basic among the hydroxides of Lanthanoids
(D) The stable oxidation state of all Lanthanoids is (+3)
44. ) Which of the following metals are present in German Silver ?
(A) Nickel, Silver and Copper (B) Zinc, Silver and Copper
(C) Germanium, Silver and Copper (D) Zinc, Nickel and Copper
45. ) Which among the following elements is radioactive ?
(A) Pm (B) La (C) Tm (D) Pr
46. ) Which of the following ion has the maximum theoretical magnetic moment ?
(A) Ti3+ (B) V3+ (C) Cr3+ (D) Co3+
47. ) The correct order of catalytic activity of Cr, V, Fe and Mn metals in increasing order is ........
(A) Fe < Mn < V < Cr (B) V < Fe < Cr < Mn (C) Cr < V < Fe < Mn (D) V < Cr < Mn < Fe
48. ) Which of the following ion will not form coloured aqueous solution ?
(A) Cu2+ (B) Fe3+ (C) Ti4+ (D) Ni2+
49. ) Which ion has magnetic moment 5.90 BM ?
(A) Mn4+ (B) Fe3+ (C) Co2+ (D) Fe2+
50. ) Which compound of lanthanoid is used to produce very low temperature by magnetic effect ?
(A) Cerium dioxide (B) Oxides of Lanthanoids
(C) Gadolinium sulphate (D) Cerium sulphate
51. ) Which of the following is general electronic configuration of Actinide series ?
(A) [Rn] 5f 0–146d0–27s2 (B) [Xe] 4f 0–145d0–106s2
(C) [Rn] 5f 0–145d0–26s2 (D) [Xe] 4f 0–145d0–16s2
52. ) What is the colour of [Ti(H2O)6]3+ complex ion ?
(A) Blue (B) Violet (C) Pink (D) Green
53. ) Which of the following is the least basic ?
(A) Yb(OH)3 (B) Ce(OH)3 (C) Nd(OH)3 (D) Gd(OH)3
54. ) Which of the following ion is colourless ?
(A) Sc3+ (B) Ti3+ (C) Mn2+ (D) Cu2+
55. ) The magnetic moment of a compound of cobalt is 3.87 BM, the compound is ..........
(A) [Co(H2O)6]+3 (B) [Co(CN)6]3– (C) Co(NO3)3 (D) [Co(H2O)6]+2
56. ) Which of the following alloys does not contain zinc ?
(A) The mixture used in filling cavity in the tooth (B) Bronze
(C) Brass (D) German silver
57. ) The theoretical magnetic moment of 27Co is 3.87 B.M. Which one is the correct compound from
the following ?
(A) Co(NO3)2 (B) CoCl3 (C) [CoF6]2– (D) [Co(NH3)6]3+
58. ) Which colour will be observed when Manganese dioxide is fused with KOH in presence of O 2 ?
(A) Purple (B) Green (C) Orange (D) Red

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59. ) Choose correct option for the statements given below.
(Correct statement - T, incorrect statement - F)
(i) Electronic configuration of transition metal ion is suitable for formation of complexes.
(ii) A chemical bond is formed between non-metal and metal atoms in interstitial compounds.
(iii) Crystal structures of Cu and Au are different.
(A) T F F (B) F T T (C) T F T (D) T T F
60. ) Which of the following alloy is not used to make resistance wire ?
(A) Nitinol (B) German silver (C) Nichrome (D) Cupronickel
61. ) What is the colour of K2MnO4 ?
(A) Red (B) Violet (C) Green (D) Blue
62. ) Which of the following mixture of metals can not form alloy ?
(A) Ni + Mg + Cr (B) Au + Cu + Cr (C) Fe + Cr + Cu (D) Ni + Cu + Cr
63. ) Which of the following ion has maximum Second ionisation enthalpy ?
(A) V+ (B) Sc+ (C) Cr+ (D) Mn+
64. ) An alloy of which of the following metals is used in filling the cavity in the tooth ?
(A) Hg, Ag, Sn, Cu, Ni (B) Hg, Au, Sn, Cu, Ni (C) Hg, Al, Sn, Cu, Zn (D) Hg, Ag, Sn, Cu, Zn
65. ) Which of the following substance is used in measurement of Chemical Oxygen Demand (COD) in
polluted water ?
(A) H2SO4 (B) KMnO4 (C) MnO2 (D) K2Cr2O7
66. ) Which of the following alloy does not contain Copper ?
(A) Nichrome (B) Bronze (C) Brass (D) German Silver
67. ) What is the experimental value of magnetic moment of metal ion in [Fe(CN)6]4– ?
(A) 4.90 BM (B) 5.00 BM (C) 0.00 BM (D) 5.92 BM
68.0) Which of the following is electronic configuration of Palladium (Pd), an element of second transition
series ?
(A) [Kr] 4d9 5s1 (B) [Kr] 4d10 5s0 (C) [Kr] 4d8 5s2 (D) [Xe] 3d10 5s0
69. ) Aqueous solution of which element is coloured ?
(A) TiCl2 (B) ZnCl2 (C) CdCl2 (D) Hg2Cl2
70. ) Which is not innertransition compound ?
(A) TiC (B) VC (C) WC (D) SiC
71. ) What is responsible from the following for innertransition elements having +3 stable oxidation
state ?
(A) Ionisation energy (B) Hydration enthalpy
(C) (A) and (B) both (D) Electronic structure
72. ) In the electronic configuration of which of the following element-electron is arranged in 5d-orbital ?
(A) 65Tb (B) 64Gd (C) 63Eu (D) 66Dy
73.
145) When alkaline KMnO4 is treated with KI, Iodide ion is oxidised to ........
(A) IO3– (B) IO– (C) I2 (D) IO4–
74. ) Identify the incorrect statement :
(A) Atomic sizes of elements of ‘4d’ series are greater than corresponding ‘3d’ series.
(B) ‘Cd’ is not a transition element.
(C) CrO is basic, but Cr2O3 is amphoteric.
(D) Atomic sizes of elements of ‘5d’ series are greater than corresponding ‘4d’ series.
75. ) The transition element that does not exhibit variable oxidation state is......
(A) Sc (B) Cu (C) Zn (D) Cr
– –
76. ) Which product is obtained during reaction of MnO4 with I in faintly alkaline condition ?
(A) I2 (B) IO– (C) IO3– (D) IO4–

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77. ) Although Zirconium belongs to 4d-transition series and Hafnium belongs to 5d-transition series, even
then show similar physical and chemical properties because.....
(A) Both belongs to d-block.
(B) Both have same number of electrons.
(C) Both have similar atomic radius.
(D) Both belongs to the same group of the periodic table.
78. ) The divalent ion of which of the following element in aqueous solution has magnetic moment 5.92
BM ?
(A) Co (B) Cr (C) Fe (D) Mn
79. ) Element A and B do not form an alloy because...
(A) Both elements have similar crystal structures.
(B) Radius of A is 115 pm while radius of B is 187 pm.
(C) Both are the members of same group.
(D) Both have similar electronic configuration in valence shell.
80. ) Which of the following pair possess same magnetic moment ?
(A) Cr3+, Mn3+ (B) Fe3+, Mn2+ (C) Fe2+, Mn2+ (D) Ni2+, Co2+
81. ) Which of the following is the correct order for theoretical magnetic moment ?
(A) Cr3+ = Mn2+ < Fe3+ (B) Cr3+ < Mn2+ < Fe3+ (C) Cr3+ < Mn2+ = Fe3+ (D) Cr3+ > Mn2+ = Fe3+
82. ) Which statement is incorrect with reference to inner transition elements ?
(A) Pm is radioactive element among actinoids
(B) Only in the electronic configuration of lanthanoids like Ce, Gd and Lu the electrons are filled
in 5d orbitals
(C) The values of ionisation enthalpy of actinoids are less than the values of ionisation enthalpy of
lanthanoids.
(D) The oxides of lanthanoids are basic.
83. ) Which alloy does not contain Ni meatal ?
(A) German silver (B) Bronze (C) Stainless steel (D) Nichrome
84. ) Which statement is not suitable for interstitial compounds ?
(A) They are hard due to localisation of free electrons.
(B) Chemical bond is formed between metal & non-metal atom.
(C) The proportion of components is not definite is such compounds.
(D) They are resistant to wear and corrosion.
85. ) Which of the following oxide has the maximum basicity ?
(A) La2O3 (B) Pr2O3 (C) Sm2O3 (D) Gd2O3
86. ) Which of the following statement is incorrect for KMnO4 ?
(A) It is an oxidising agent. (B) It is used as antiseptic.
(C) It is used as bleaching agent in textile industries. (D) It is dark purple coloured amorphous substance.
87. ) Which of the following ion has the maximum theoretical magnetic moment ?
(A) Fe3+ (B) Cr3+ (C) Ti3+ (D) Co3+
88. ) Which of the following compound is used in gas lighter ?
(A) CeO2 (B) Pyrophoric misch metal
(C) Nichrome (D) Nitinol
89. ) Which of the following is a transition element as per the ground state electronic configuration ?
(A) Au (B) Hg (C) Cd (D) Zn
90. ) Which of the following option is the correct order for the basic strength of metallic hydroxides ?
(A) Al(OH)3 < Lu(OH)3 < Ce(OH)3 < Ca(OH)2 (B) Ca(OH)2 < Al(OH)3 < Lu(OH)3 < Ce(OH)3
(C) Lu(OH)3 < Ce(OH)3 < Al(OH)3 < Ca(OH)2 (D) Lu(OH)3 < Ce(OH)3 < Ca(OH)2 < Al(OH)3
91. ) Which of the following is alloy of Sn ?
(A) Bronze (B) Brass (C) German-silver (D) Stainless steel
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 ) Which of the following is alloy of Sn ? 9724219216
(A) Bronze (B) Brass (C) German-silver (D) Stainless steel
92. ) What is the atomic number of an element of M2+ ion. Whose electronic structure is [Ar]3d8 ?
(A) 27 (B) 25 (C) 26 (D) 28
93. ) Which compounds of Lanthanides are used in pigments ?
(A) Lu(OH)3 (B) CeO2 (C) Tb(OH)3 (D) Ce(OH)3
94. ) Stabilization of oxidation state in Lanthanoid elements depends on which of the following ?
(A) Hydration enthalpy and Ionization energy (B) Electronic configuration
(C) Enthalpy (D) Internal energy
95. ) State the use of potassiumdichromat [K2Cr2O7].
(A) As an oxidizing agent to convert ferric ion from ferrous ion in acidic medium.
(B) As an insecticide.
(C) In electroplating.
(D) As reducing agent.
96. ) In which of the following ion d-d transition is not possible ?
(A) Mn2+ (B) Cu2+ (C) Ti4+ (D) Cr3+
97. ) In which of the following atom possesses highest oxidation state ?
(A) (n – 1)d3ns2 (B) (n–1)d5ns2 (C) (n–1)d8ns2 (D) (n–1)d5ns2
98.
120) Why 21Sc is not considered as transition element ?
(A) In the compound d-orbitals are empty.
(B) Ionic volume of Sc is very small.
(C) Sc does not possess more than one oxidation number.
(D) Sc possesses acidic-basic both properties.
99. ) On balancing the given redox reaction,
2- 2- + 3+ 2- c
a CrO7 + b SO 3(aq) + cH(aq) ® 2a Cr(aq) + b SO 4(aq) +
H 2 O(l )
2
the coefficients a, b and c are found to be, respectively .........
(A) 8, 1, 3 (B) 1, 3, 8 (C) 3, 8, 1 (D) 1, 8, 3
100. ) Which of the following statements are INCORRECT ?
(a) All the transition metals except scandium form MO oxides which are ionic.
(b) The highest oxidation number corresponding to the group number in transition metal oxides is
attained in Sc2O3 to Mn2O7.
(c) Basic character increases from V2O3 to V2O4 to V2O5.
(d) V2O4 dissolves in acids to give VO 34 - salts.
(e) CrO is basic but Cr2O3 is amphoteric.
Choose the correct answer from the options given below :
(A) (b) and (c) only (B) (a) and (e) only (C) (b) and (d) only (D) (c) and (d) only

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