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Class 12 Chemistry MCQ Chapter 9 Coordination Compounds
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Coordination Compounds
Chapter: 9
| MCQ |
1. Which geometrical shape is common for octahedral coordination compounds?
(i) Tetrahedral.
(ii) Square planar.
(iii) Linear.
(iv) Octahedral.
Ans: (iv) Octahedral.
2. The oxidation number and the coordina- tion number of chromium in [Cr(C2O4)3]3- respectively is:
(i) +3,3
(ii) -3,3
(iii) +3,6
(iv) -3,6
Ans: (iii) +3,6
3. Which of the following complex will show only optical isomerism?
(i) [CoCl 2 (NH3)4]+
(ii) [Co ((NH3)2(en)2]3+
(iii) [Co ((C2O3)4]3-
(iv) All of the above.
Ans: (ii) [Co ((NH3)2(en)2]3+
4. What is the secondary valence of palladium (Pd) in the complex PdCl₂·4NH₃?
(i) 2
(ii) 4
(iii) 6
(iv) 0
Ans: (ii) 4
5. The complexes [CoCl₂(NH₃)₄]⁺ and [CoCl₂(NH₃)₄]⁺ have the same empirical formula but different properties. What is this phenomenon called?
(i) Isomerism.
(ii) Allotropy.
(iii) Homology.
(iv) Enantiomerism.
Ans: (i) Isomerism.
6. The number of ions formed when cuprammonium sulphate is dissolved in water is:
(i) 1
(ii) 2
(iii) 4
(iv) zero.
Ans: (ii) 2
7. A group of atoms can function as a ligand only when:
(i) It is a small molecule.
(ii) It has an unshared electron pair.
(iii) It is a negatively charged ion
(iv) It is a positively charged ion.
Ans: (ii) It has an unshared electron pair.
8. What happens to complex ions such as [Fe(CN)₆]⁴⁻ when dissolved in water?
(i) They completely dissociate into Fe²⁺ and CN⁻ ions.
(ii) They remain intact as complex ions.
(iii) They convert into double salts.
(iv) They precipitate as insoluble compounds.
Ans: (ii) They remain intact as complex ions.
9. What is the oxidation number of the central atom in [Cu(CN)4]3–?
(i) +1
(ii) +2
(iii) +3
(iv) 0
Ans: (i) +1
10. IUPAC name of K.Fe (CN),] is:
(i) Hexacyano ferrate (II).
(ii) Potassium ferricyanide.
(iii) Potassium hexacyano ferrate (II).
(iv) Potassium hexacyano ferrate.
Ans: (iii) Potassium hexacyano ferrate (II).
11. The oxidation number of cobalt in [K]Co(CO)4 ] is:
(i) – 1
(ii)-3
(iii) + 1
(iv) +3
Ans: (i) – 1
12. Which type of isomerism is shown by the complex compounds?
[Co(NH3)5Br]SO4 and [Co(NH3)5SO4]Br?
(i) Ionisation.
(ii) coordination.
(iii) Linkage.
(iv) Optical.
Ans: (i) Ionisation.
13. Primary and secondary valency of Pt in [Pt(en)2Cl2] are
(i) 4, 4
(ii) 4, 6
(iii) 6, 4
(iv) 2, 6
Ans: (ii) 4, 6
14. [Ti(H2O)6]8+ is paramagnetic in due to:
(i) No unpaired electrons.
(ii) One unpaired electron.
(iii) Two unpaired electrons.
(iv) Three unpaired electrons.
Ans: (ii) One unpaired electron.
15. A group of atoms can function as a ligand only when:
(i) It is a negatively charged ion.
(ii) It is a positively charged ion.
(iii) It is a small molecule.
(iv) It has an unshared pair of electrons.
Ans: (iv) It has an unshared pair of electrons.
