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Coordination Compounds Class 12 Chemistry MCQs Pdf
1. The sum of coordination number of oxidation number of the metal M in the complex [M(en)2 C204] Cl are
(a) 7
(b) 8
(c) 9
(d) 6
Answer/Explanation
Answer: c
Explaination: (c) 9 = 6 + 3
2. Which of the following will not give test for Cl– with AgNO3(aq) at 25°C?
(a) COCl3.5NH3
(b) COCl3.6NH3
(c) COCl3.3NH3
(d) COCl3.4NH3
Answer/Explanation
Answer: c
Explaination:
(c) [Co(NH3)3 Cl3) does not have counter ions, so will not react with AgNO3(aq)
3. Which of these statements about [Co(CN)6]3- is true?
(a) It has 4 unpaired electron, high spin
(b) No unpaired electron, high spin
(c) No unpaired electron, low spin
(d) 4 unpaired electron, low spin
Answer/Explanation
Answer: c
Explaination:
(c) [CO(CN)6]3- has d²sp3 hybridisation, no unpaired electron, low spin.
4. The correct order of the stoichiometries of AgCl formed when AgNO3 in excess is treated with complexes: COCl3.6NH3, C0Cl3.5NH3, C0Cl3.4NH3 respectively is
(a) 3AgCl, lAgCl, 2AgCl
(b) 3AgCl, 2AgCl, 1AgCl
(c) 2AgCl, 3AgCl, 2AgCl
(d) lAgCl, 3AgCl, 2AgCl
Answer/Explanation
Answer: b
Explaination:
(b) [Co(NH3)6Cl3], [CO(NH3)5Cl] Cl2,
[CO(NH3)4Cl2], will form 3AgCl, 2AgCl and lAgCl respectively.
5. Correct increasing order of wavelength of absorption in visible region for complex of Co3+ is
Answer/Explanation
Answer: d
Explaination:
(d) ∵ en is bidentate ligand will form stable complex will absorb highest energy but lowest wavelength, [Co(H2O)6]3+ will absorb lowest energy, highest wavelength.
6. Pick out the correct statement with respect to [Mn(CN)J2-
(a) It is sp²d² hybridised, tetrahedral
(b) It is d²sp3 hybridised, octahedral
(c) It is dsp² hybridised, square planar
(d) It is sp3d² hybridised octahedral
Answer/Explanation
Answer: b
Explaination: (b) d²sp3, inner orbital complex.
7. Facial and meridional isomerism will be shown by
(a) [Co(NH3)3Cl3]
(b) [Co(NH3)4Cl2] Cl
(c) [Co(en)3] Cl3
(d) [Co(NH3)5Cl] Cl2
Answer/Explanation
Answer: a
Explaination: (a) will show fac-mer isomerism
8. Which one has highest molar conductivity?
(a) [Pt(NH3)2 Cl2]
(b) [CO(NH3)4 Cl2] Cl
(c) K4[Fe(CN)6]
(d) [Cr(H2O)6] Cl3
Answer/Explanation
Answer: c
Explaination: (c) will have highest molar conductivity.
9. Which one will show optical isomerism?
(a) [Co(NH3)3Cl3]
(b) cis-[Co(en)2 Cl2] Cl
(c) trans-[Co(en)2 Cl2] Cl
(d) [Co(NH3)4 Cl2] Cl
Answer/Explanation
Answer: b
Explaination:
(b) will show optical isomerism because it does not have symmetry and polydentate ligand.
10. The pair having the same magnetic moment is (At No. Cr = 24, Mn = 25, Fe = 26, Co = 27)
(а) [Cr(H2O)6]2+ and [CoCl4]2-
(b) [Cr(H2O)6]2+ and [Fe (H2O)6]2+
(c) [Mn(H2O)6]2+ and[Cr(H2O)6]2+
(d) [COCl4]2- and [Fe(H2O)6]2+
Answer/Explanation
Answer: b
Explaination:
(b) [Cr(H2O)6]2+ has 4s°3d4 electronic configuration, has four unpaired electrons. [Fe(H2O)6]2+ has 4s°3d6 has four unpaired electrons.
11. On treatment of 100 mL of 0.1 MCOCl3.6H2O with excess of AgNO3, 1.2 × 1022 ions are precipitated. The complex is
(a) [Co(H2O)4Cl2]Cl.2H2O
(b) [Co(H2O)3Cl3]3H2O
(c) [Co(H2O)6] Cl3
(d) [Co(H2O)5 Cl] Cl2.H2O
Answer/Explanation
Answer: d
Explaination:
(d) [Co(H2O)5 Cl] Cl2.H2O + 2AgNO3 (aq)
100 × 0.1 = 10 millimoles
→ 2AgCl↓ + [Co(H2O)5Cl](NO3)2.H2O 20 millimoles of AgCl
= 20 × 10-3 × 6 × 1023
= 120 × 1020 = 1.2 × 1022
∴ 1.2 × 1022 ions are precipitated.
12. Among the ligands NH3, en, CN and CO, the correct order of field strength is
(a) NH3 < en < CN– < CO
(b) CN– < NH3 < CO < en
(c) en < CN–< NH3 < CO
(d) CO < NH3 < en < CN–
Answer/Explanation
Answer: a
Explaination: (a) is correct order.
13. Which cf the following complexes formed by Cu2+ ions is most stable? [NCERT Exemplar]
Answer/Explanation
Answer: b
Explaination:
(b) is most stable, higher the value of ‘K’, more will be log K, therefore, more stable will be complex.
14. The stabilisation of coordination compounds due to chelation is called the chelate effect. Which of the following is the most stable complex species? [NCERT Exemplar]
(a) [Fe(CO)5]
(b) [Fe(CN)6]3-
(c) [Fe(C2O4)3]3-
(d) [Fe(H2O)6]3+
Answer/Explanation
Answer: c
Explaination:
(c) is most stable because C2O4– is bidentate ligand.
15. Indicate the complex ion which shows geometrical isomerism.
(a) [Cr(H2O)4Cl2]+
(b) [Pt(NH3)3 Cl]
(c) [Co(NH3)6]3+
(d) [Co(CN)5(NC)]3-
Answer/Explanation
Answer: a
Explaination:
16. The CFSE for octahedral [CoCl6]4- is 18,000 cm-1. The CFSE for tetrahedral [CoCl4]2- will be [NCERT Exemplar]
(a) 18,000 cm-1
(b) 16,000 cm-1
(c) 8,000 cm-1
(d) 20,000 cm-1
Answer/Explanation
Answer: c
Explaination:
(c) ∆t = \(\frac{4}{9}\) ∆0 = \(\frac{4}{9}\) × 18000 = 8000
17. Due to the presence of ambidentate ligands coordination compounds show isomerism. Palladium complexes of the type [Pd(C6H5)2(SCN)2] and [Pd(C6H5)2(NCS)2] are [NCERT Exemplar]
(a) linkage isomers
(b) coordination isomers
(c) ionisation isomers
(d) geometrical isomers
Answer/Explanation
Answer: a
Explaination:
(a) SCN is ambidentate ligand, therefore, it shows linkage isomerism.
18. The compounds [Co(SO4)(NH3)5]Br and [CO(SO4)(NH3)5]Cl represent [NCERT Exemplar]
(a) linkage isomerism
(b) ionisation isomerism
(c) coordination isomerism
(d) no isomerism
Answer/Explanation
Answer: b
Explaination:
(b) It shows ionisation isomerism v counter ions can act as ligand.
19. A chelating agent has two or more than two donor atoms to bind to a single metal ion. Which of the following is not a chelating agent? [NCERT Exemplar]
(a) thiosulphato
(b) oxalato
(c) glycinato
(d) ethane-1, 2-diamine
Answer/Explanation
Answer: a
Explaination:
(a) S2O32- (thiosulphato) ion is unidentate ligand and is not a chelating agent.
20. The solution of the complex [Cu(NH3)4] SO4 in water will
(a) give the tests of Cu2+ ion
(b) give the tests of NH3
(c) give the tests of SO42- ions
(d) not give the tests of any of the above
Answer
Answer: c
21. IUPAC name of [Pt(NH3)3 Br (NO2) Cl] Cl isw
(a) triamminechlorodibromidoplatinum (IV) chloride
(b) triamminechloridobromidonitrochloride- platinum (IV) chloride
(c) triamminebromidochloridonitroplatinum (IV) chloride
(d) triamminenitrochlorobromoplatinum (IV) chloride
Answer
Answer: c
23. Trunbull’s blue is
(a) Ferricyanide
(b) Ferrous ferricyanide
(c) Ferrous cyanide
(d) Fe3[Fe(CN)6]4
Answer
Answer: b
23. Primary and secondary valency of Pt in [Pt(en)2Cl2] are
(a) 4, 4
(b) 4, 6
(c) 6, 4
(d) 2, 6
Answer
Answer: d
24. The complex ions [Co(NH3)5(NO2)]2+ and [Co(NH3)5 (ONO)]2+ are called
(a) Ionization isomers
(b) Linkage isomers
(c) Co-ordination isomers
(d) Geometrical isomers
Answer
Answer: b
25. Which of the following has square planar structure?
(a) [NiCl4]2-
(b) [Ni(CO)4]
(c) [Ni(CN)4]2-
(d) None of these
Answer
Answer: c
26. Which of the following has magnesium?
(a) Chlorophll
(b) Haemocyanin
(c) Carbonic anhydrate
(d) Vitamin B12
Answer
Answer: a
27. Mohr’s salt is
(a) Fe2(SO4) 3 . (NH4)2SO4 . 6H2O
(b) FeSO4 . (NH4)2 . SO4 . 6H2O
(c) MgSO4 . 7H2O
(d) FeSO4 . 7H2O
Answer
Answer: b
28. Which of the following shall form an octahedral complex?
(a) d4 (low spin)
(b) d8 (high spin)
(c) d6 (low spin)
(d) All of these
Answer
Answer: b
29. EDTA is used for the estimation of
(a) Na+ and K+ ions
(b) Cl– and Br– ions
(c) Cu2+ and Cs+ ions
(d) Ca2+ and Mg2+ ions
Answer
Answer: d
30. The name of complex [Fe(CN)6]3- is
(a) Tricyanido ferrate (III) ion
(b) Hexacyanido ferrate (III) ion
(c) Hexacyanido iron (III)
(d) Hexacyanido ferrate (II) ion
Answer
Answer: b
Note: In the following questions two or more options may be correct. (Q.21 to Q.25)
31. Atomic number of Mn, Fe and Co are 25,26
and 27 respectively. Which of the following inner orbital octahedral complex ions are diamagnetic? [NCERT Exemplar]
(a) [CO(NH3)6]3+
(b) [Mn(CN)]3-
(c) [Fe(CN)6]4-
(d) [Fe(CN)6]3-
Answer/Explanation
Answer: a
Explaination:
(a) [Co(NH3)6]3+ and (c) [Fe(CN)6]4- are diamagnetic due to absence of unpaired electron.
d²sp3 hybridisation.
32. Atomic number of Mn, Fe, Co and Ni i are 25, 26, 27 and 28 respectively. Which of the following outer orbital octahedral ’complexes have same number of unpaired electrons? [NCERT Exemplar]
(a) [MnCl6]3-
(b) [FeF6]3-
(c) [CoF6]3-
(d) [Ni(NH3)6]2+
Answer/Explanation
Answer:
Explaination:
(a) and (c).
Both have same number of unpaired electrons.
33. Which of the following options are correct for [Fe(CN)6]3- complex? [NCERT Exemplar]
(a) d²sp3 hybridisation
(b) sp3cf hybridisation
(c) paramagnetic
(d) diamagnetic
Answer/Explanation
Answer:
Explaination:
(a) and (c) are d²sp3 and paramagnetic.
34. An aqueous pink solution of cobalt(II) chloride changes to deep blue on addition of excess of HC1. This is because _________ . [NCERT Exemplar]
(a) [Co(H2O)6]2+ is transformed into [CoCl6]4-
(b) [Co(H2O)6]2+ is transformed into [CoCl4]2-
(c) tetrahedral complexes have smaller crystal field splitting than octahedral complexes.
(d) tetrahedral complexes have larger crystal field splitting than octahedral complex.
Answer/Explanation
Answer:
Explaination:
(b) and (c) are correct statement ∆t = \(\frac{4}{9}\) ∆0
35. Identify the optically active compounds from the following: ]NCERT Exemplar]
(a) [Co(en)3]3+
(b) trans- [Co(en)2 Cl2]+
(c) cis- [Co(en)2 Cl]+
(d) [Cr (NH3)5Cl]
Answer/Explanation
Answer:
Explaination:
(a) and (c) are optically active compounds.
36. Math the complex ions given in Column I with the colours given in Column II and assign the correct code:
| Column I (Complex ion) |
Column II (Colour) |
| (A) [Co(NH3)]3+ | (1) Violet |
| (B) [Ti(H2O)6]3+ | (2) Green |
| (C) [Ni(H2O)6F | (3) Pale blue |
| (D) (Ni (H2O)4(en)]2+(aq) | (4) Yellowish orange |
| (5) Blue |
Code: (i) A (1) B (2) C (4) D (5)
(ii) A (4) B (3) C (2) D (1)
(iii) A (3) B (2) C (4) D (1)
(iv) A (4) B (1) C (2) D (3)
Answer/Explanation
Answer:
Explaination:
(ii) A (4) B (3) C (2) D (1)
37. Match the coordination compounds given in Column I with the central metal atoms given in Column II and assign the correct code: [NCERT Exemplar]
| Column I (Coordination compound) |
Column II (Central metal atom) |
| (A) Chlorophyll | (1) rhodium |
| (B) Blood pigment | (2) cobalt |
| (C) Wilkinson catalyst | (3) calcium |
| (D) Vitamin B | (4) iron |
| (5) magnesium |
Code: (i) A (5) B (4) C (1) D (2)
(ii) A (3) B(4) C (5) D (1)
(iii) A (4) B (3) C (2) D (1)
(iv) A (3) B (4) C(l) D (2)
Answer/Explanation
Answer:
Explaination:
(i) A (5) B (4) C (1) D (2)
38. Match the i complex ions given in Column with the hybridisation and number of unpaired electrons given in Column II and assign the correct code: [NCERT Exemplar]
| Column I (Complex ion) |
Column II (Hybridisation, number of unpaired electrons) |
| (A) [Cr(H2O)6]3+ | (1) dsp2, 1 |
| (B) [Co(CN4)]2- | (2) sp3d2, 5 |
| (C) [Ni(NH3)6]2+ | (3) d2sp3, 5 |
| (D) [MnF6]4- | (4) sp3, 4 |
| (5) sp3d2, 2 |
Code: (i) A (3) B (1) C(5) D (2)
(ii) A (4) B (3) C (2) D (1)
(iii) A (3) B (2) C (4) D (1)
(iv) A (4) B (1) C (2) D (3)
Answer/Explanation
Answer:
Explaination:
(i) A (3) B (1) C (5) D (2)
39. In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
(a) Assertion and reason both are hue, reason is correct explanation of assertion.
(b) Assertion and reason both are true but reason is not the correct explanation of assertion.
(c) Assertion is true, reason is false.
Assertion: Toxic metal ions are removed by the chelating ligands. [NCERT Exemplar]
Reason: Chelate complexes tend to be more stable.
Answer/Explanation
Answer: a
Explaination:
(a) Assertion and reason both are true reason is correct explanation of assertion.
40. If ∆o > P for d4, electronic configuration in terms of CFT is _________ .
Answer/Explanation
Answer:
Explaination:
\(t_{2 \mathrm{g}}^{4} e g^{0}\)
41. If ∆o < P for d4, electronic configuration interms of CFT is _________ .
Answer/Explanation
Answer:
Explaination:
\(t_{2 \mathrm{g}}^{4} e g^{2}\)
42.
are used for electroplating Ag and Au respectively. [True/False]
Answer/Explanation
Answer:
Explaination: True.
43. Ca2+ and Mg2+ are removed and estimated by using EDTA from hard water. [True/False]
Answer/Explanation
Answer:
Explaination: True.
44. Ni2+ forms scarlet red complex with dimethyl glyoxime. [True/False]
Answer/Explanation
Answer:
Explaination: True.
45. How many moles of AgCl will be precipitated when an excess of AgNO3 is added to a molar solution of [CrCl(H2O)5]Cl2? [Uttarakhand 2019]
Answer/Explanation
Answer:
Explaination:
2 moles of AgCl will be precipitated. [CrCl(H2O)5]Cl2 + 2AgNO3(aq) → [CrCl(H2O)5](NO3)2 + 2AgCl(s) (white ppt.)
46. Differentiate between a double salt and a complex. [Uttarakhand 2019]
Answer/Explanation
Answer:
Explaination:
A double salt dissociates into simple ions completely when dissolved in water such as camallite (KCl.MgCl2.6FI2O) while a complex ion such as [Fe(CN)6]4- does not dissociate into Fe2+.
47. What is the colour of [Co(NH3)6]3+ 3Cl?
Answer/Explanation
Answer:
Explaination: Yellow.
48. Give one similarity and one dissimilarity between primary and secondary valences.
Answer/Explanation
Answer:
Explaination:
Similarity: Both are satisfied by negative ions. Secondary valences are also satisfied by neutral molecules.
Dissimilarity: Primary valences are normally ionisable while secondary valences are non- ionsable.
49. What is meant by double salt?
Answer/Explanation
Answer:
Explaination:
Double Salt: When two salts in equimolar ratio are crystallised together from their saturated solution they are called double salts, e.g. FeSO4 .(NH4)2SO4.6H2O (Mohr’s salt). Potash alum is K2SO4.Al2(SO4)3. 24H2O.
50. Define coordination number.
Answer/Explanation
Answer:
Explaination:
Coordination number is defined as the number of donor atoms which form coordinate bonds with a central metal ion in complex compound or ion.
51. What is the coordination number of a central ion in octahedral complex? Why does NH3 form complex but NH4+ ion does not?
Answer/Explanation
Answer:
Explaination:
The coordination number of a central ion in octahedral complex is 6. NH3 acts as ligand because in NH3, nitrogen has lone pair of electron, whereas NH4+ does not have lone pair of electron and secondly, it is positively charged, therefore, it will be repelled by central metal ion.
52. What is the coordination number of Fe in [Fe(EDTA)]–?
Answer/Explanation
Answer:
Explaination:
The coordination number of Fe is 6. It is because EDTA is hexadentate ligand, it can form six coordinate bonds on shown below. Two bonds are formed by two ‘N’ atoms having lone pair and four bonds are formed by four oxygen atoms having negative charge. f . ?
53. Write IUPAC name of K3[Fe(C2O4)3]. [Delhi 2013(C)]
Answer/Explanation
Answer:
Explaination: Potassium trioxalatoferrate(III).
54. Name the coordination compound: K3[CrF6]. [Foreign 2011]
Answer/Explanation
Answer:
Explaination: Potassium hexafluorido chromate(III)
55. Write the IUPAC name of [Pt(NH3)4Cl2]Cl2. [AI 2011(C)]
Answer/Explanation
Answer:
Explaination: Tetraaminedichloridoplatinum(IV) chloride
56. Write the IUPAC name of [Pt(NH3)3(NO)Cl2] Br2. [Delhi 2011(C)]
Answer/Explanation
Answer:
Explaination: Triamminedichloridonitrosyl platinum(IV) bromide.
57. Write the IUPAC name of [CO(CN)2(NH3)4]Cl. [Delhi 2011(C)]
Answer/Explanation
Answer:
Explaination: Tetraamminedicyanocobalt(III) chloride.
58. Write the IUPAC name of [PtCl(NH2CH3)(NH3)2]Cl. [Delhi 2011(C)]
Answer/Explanation
Answer:
Explaination: Diamminechlorido methanamine platinum(II) chloride.
59. Write the IUPAC name of [Cr(NH3)6] [Co(CN)6]. [AI 2011(C)]
Answer/Explanation
Answer:
Explaination: Hexaamminechromium(III) hexacyanoco- baltate(III).
60. Write IUPAC name and identify the ligands in complex ion [Co(en)2Cl(ONO)]+.
Answer/Explanation
Answer:
Explaination:
Ethane-1, 2-diamine (en), chlorido (Cl), nitrito—0 (ONO) are ligands. IUPAC name is chloridobis (Ethane-l,2-diamine)nitrito—0— cobalt(III).
61. Write the chemical formula for the complex compound: Sodium (ethylenediaminetetraacetate) chromate(II).
Answer/Explanation
Answer:
Explaination: Na4[Cr(EDTA)]
62. Which type of isomerism is shown by [Co(NH3)5ONO]2+ and [Co(NH3)5NO2]2+?
Answer/Explanation
Answer:
Explaination: Linkage isomerism.
63. What type of isomerism is exhibited by the complex [CO(NH3)5NO2]2+? [Foreign 2014]
Answer/Explanation
Answer:
Explaination: Linkage isomerism.
64. What type of isomerism is shown by the following complex: [Co(NH3)6][Cr(CN)6] [Delhi 2017; Foreign 2014]
Answer/Explanation
Answer:
Explaination: Coordination isomerism.
65. Write coordination isomer of [CO(NH3)6] [Cr(C2O4)3].
Answer/Explanation
Answer:
Explaination:
[Co(NH3)6][Cr(C2O4)3] has coordination isomer [Cr(NH3)6][Co(C2O4)3].
66. What type of isomerism is exhibited by the following complex: [CO(NH3)5SO4]Cl [Similar to CBSE 2018; Delhi 2017; Foreign 2014]
Answer/Explanation
Answer:
Explaination: Ionisation isomerism.
67. Give an example of ionisation isomerism.
Answer/Explanation
Answer:
Explaination:
[Co(NH3)5Br]SO4 and [Co(NH3)5SO4)]Br is the example of ionisation isomerism.
68. Give an example of solvate isomerism.
Answer/Explanation
Answer:
Explaination:
[Cr(H2O)6]Cl3 (violet) and its solvate isomer is [Cr(H2O0)5Cl] Cl2.H2O.
69. Give any two limitations of valence bond theory.
Answer/Explanation
Answer:
Explaination:
(i) It does not explain the colour indicated by coordination compounds.
(ii) It does not distinguish between strong and weak ligands.
70. Which has strong field strength SCN– or CN–?
Answer/Explanation
Answer:
Explaination: CN–. (According to spectrochemical series)
71. Why removal of water from [Ti(H2O)6] Cl3 on heating renders it colourless?
Answer/Explanation
Answer:
Explaination:
This is due to the fact that in the absence of ligand, crystal field splitting does not occur and hence the substance is colourless.
72. Give an example of homoleptic carbonyl.
Answer/Explanation
Answer:
Explaination: Tetracarbonylnickel(O).
73. What is meant by the instability constant of coordination compounds?
Answer/Explanation
Answer:
Explaination:
The reciprocal of the formation constant is called the instability constant of coordination compounds.
74. Name a coordination compound used in the treatment of lead poisoning.
Answer/Explanation
Answer:
Explaination: EDTA.
75. Write IUPAC name of the complex: [CoCl2(en)2]+.
Answer/Explanation
Answer:
Explaination: Dichloro bis (ethane 1,2-diamine) cobalt(II).
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