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Coordination Compounds Class 12 MCQs Questions with Answers
Solve this Coordination Compounds Multiple Choice Questions of Class 12 Chemistry Chapter 9 MCQ, so as not to miss out on any concept from being clear about what they mean!
Question 1.
The coordination number of cobalt in [Co(en)3]3+ is
(a) 3
(b) 4
(c) 6
(d) 2
Answer
Answer: (c) 6
Question 2.
The IUPAC name of K3[Fe(CN)5NO] is
(a) potassium pentacyanonitrosylferrate(II)
(b) potassium pentacyanonitroferrate(II)
(c) potassium pentacyanonitrosylferrate(III)
(d) tripotassium pentacyanonitrosy If errate(II)
Answer
Answer: (a) potassium pentacyanonitrosylferrate(II)
Question 3.
Which of the following is hexadentate ligand?
(a) diene
(b) CN–
(c) en
(d) EDTA
Answer
Answer: (d) EDTA
Question 4.
On adding AgNO3 solution to 1 mole of PdCl2. 4NH3 two moles of AgCl are formed. The secondary valency of Pd in the complex will be
(a) 0
(b) 2
(c) 4
(d) 1
Answer
Answer: (c) 4
Question 5.
What kind of isomerism exists between [Cr(H2O)6]Cl3 and [Cr(H3O)5Cl]Cl2. H2O?
(a) Linkage isomerism
(b) Solvate isomerism
(c) Ionisation isomerism
(d) Coordination isomerism
Answer
Answer: (b) Solvate isomerism
Question 6.
The IUPAC name of [PtCI(NO2) (NH3)4]SO4 is
(a) Tetraamminechloridonitrito-N- platinate (III) sulphate
(b) Tetraamminechloridonitrito-N- platinum (IV) sulphate
(c) Chloridonitrito-N- ammineplatinum(IV) sulphate
(d) Tetraamminechloridonitrito-N- platinate (IV) sulphate
Answer
Answer: (b) Tetraamminechloridonitrito-N- platinum (IV) sulphate
Question 7.
Which metal is present in vitamin B12 cyanocobalamin?
(a) Fe
(b) Co
(c) Mg
(d) Pt
Answer
Answer: (b) Co
Question 8.
Which is present in metal carbonyls?
(a) M-C σ bond
(b) M – C π bond
(c) M-C σ and M – C π bond
(d) None of these
Answer
Answer: (c) M-C σ and M – C π bond
Question 9.
How many ions are given by [Co(NH3)5 Br] Cl2 complex in water?
(a) 4
(b) 2
(c) 6
(d) 3
Answer
Answer: (d) 3
Question 10.
Which complex exhibits geometrical isomerism?
(a) [MnBr4]2+
(b) [Pt(NH3)3Cl]+
(c) [PtCl2(P(C2H2)3)2]
(d) [Fe(H2O)5NO]2+
Answer
Answer: (c) [PtCl2(P(C2H2)3)2]
Question 11.
The IUPAC name of K[Ag(CN)2] is
(a) dicyanidosilver(l)
(b) dicyanidoargentate(l)
(c) potassium dicyanidoargentate(l)
(d) potassium dicyanidoargentate(ll)
Answer
Answer: (c) potassium dicyanidoargentate(l)
Question 12.
The IUPAC name of the compound K2[Ni(CN)4] is
(a) Potassium tetracyanidonickelate(lll)
(b) Potassium tetracyanidonickelate(ll)
(c) Potassium tetracyanidonickel(lll)
(d) Potassium tetracyanidonickel(ll)
Answer
Answer: (b) Potassium tetracyanidonickelate(ll)
Question 13.
Which metal carbonyl has the strongest C-O bond?
(a) Mn(CO)6+
(b) Cr(CO)6
(c) V(CO)6
(d) Fe(CO)5
Answer
Answer: (a) Mn(CO)6+
Question 14.
In the following which metal complex ion has zero oxidation number?
(a) [Cr(H2O)6]3+
(b) [CuCl4]2-
(c) [Fe(CO)5]
(d) [Fe(CN)6]3-
Answer
Answer: (c) [Fe(CO)5]
Question 15.
In the following chelating ligand is
(a) OH–
(b) H2NCH2CH2NH2
(c) Cl–
(d) CN–
Answer
Answer: (b) H2NCH2CH2NH2
Question 16.
What is the coordination number in the K3[Cr(C2O4)3] coordinate compound
(a) 3
(b) 6
(c) 4
(d) 2
Answer
Answer: (b) 6
Question 17.
What is the oxidation state of Fe in K3[Fe(CN)6]
(a) +2
(b) +3
(c) +4
(d) +1
Answer
Answer: (b) +3
Question 18.
K3[Al(C2O4)3] is named as
(a) potassium trioxalatoaluminate (III)
(b) potassium aluminooxalate
(c) potassium aluminium(lll) oxalate
(d) potassium trioxalatoaluminate (II)
Answer
Answer: (a) potassium trioxalatoaluminate (III)
Question 19.
Predict the number of ions produced per formula unit in an aqueous solution of [Co(en)3]Cl3.
(a) 4
(b) 3
(c) 6
(d) 2
Answer
Answer: (a) 4
Question 20.
When one mole of CoCl3.5NH3 was treated with excess of silver nitrate solution, 2 mol of AgCl was precipitated. The formula of the compound is:
(a) [Co(NH3)5Cl2]Cl
(b) [Co(NH3)5Cl]Cl2
(c) [Co(NH3)4Cl2] (NH3)Cl
(d) [Co(NH3)3Cl3] (NH3)2
Answer
Answer: (b) [Co(NH3)5Cl]Cl2
Question 21.
The absorption maxima of several octahedral complex ions are as follows:
The crystal field splitting is maximum for:
(a) [CO(H2O)6]3+
(b) [CO(CN)6]3-
(c) (CO(NH3)6]3+
(d) All the complex ions have the same splitting, Δ0.
Answer
Answer: (b) [CO(CN)6]3-
Assertion and Reason Type Questions
The questions given below consist of an assertion and a reason. Use the following key to choose the appropriate answer.
(a) Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).
(b) Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A).
(c) Assertion (A) is correct, Reason (R) is wrong statement.
(d) Assertion (A) is wrong, but Reason (R) is correct statement.
Question 22.
Assertion: The complex [Co(NH3)3Cl3] does not give precipitate with silver nitrate solution.
Reason: The given complex is non-ionizable.
Answer
Answer: (a) Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).
Question 23.
Assertion: The complex ion trans [Co(en)2Cl2]+ is optically active.
Reason: It is an octahedral complex.
Answer
Answer: (b) Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A).
Question 24.
Assertion: NF3 is weaker ligand than N(CH3)3.
Reason: NF3 ionises to give F– ions in aqueous solution.
Answer
Answer: (c) Assertion (A) is correct, Reason (R) is wrong statement.
Question 25.
Assertion: The [Ni(en)3]Cl2 (en = ethylenediamine) has lower stability than [Ni(NH3)6]Cl2.
Reason: In [Ni(en)3]Cl2, the geometry of Ni is trigonal bipyramidal.
Answer
Answer: (d) Assertion (A) is wrong, but Reason (R) is correct statement.
Question 26.
Assertion: [Ni(CO)4] is diamagnetic and tetrahedral in shape.
Reason: [Ni(CO)4] contains no unpaired electron and involves dsp² hybridisation.
Answer
Answer: (c) Assertion (A) is correct, Reason (R) is wrong statement.
Question 27.
Assertion: The ligands -NO2– and ONO– are ambident in nature.
Reason: They form linkage isomers.
Answer
Answer: (a) Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).
Question 28.
Assertion: The complex [Fe(CN)6]4- is diamagnetic though iron (II) has 3d6 configuration.
Reason: CN– is a strong ligand and has the configuration: t2g6. Therefore, it has no unpaired electrons.
Answer
Answer: (a) Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).
Question 29.
Assertion: The oxidation state of Pt in Zeise salt is 0.
Reason: Zeise salt is non-ionic complex.
Answer
Answer: (c) Assertion (A) is correct, Reason (R) is wrong statement.
Question 30.
Assertion: Optical isomerism is not shown by square planar complexes.
Reason: Square planar complexes do not have chiral structures.
Answer
Answer: (a) Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).
Question 31.
Assertion: Tetrahedral complexes do not show geometrical isomerism.
Reason: Bond angle in tetrahedral geometry is 109.5°.
Answer
Answer: (b) Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A).
Question 32.
Assertion: [Ni(CO)4] is diamagnetic complex.
Reason: It involves sp³ hybridisation and there is no unpaired electron.
Answer
Answer: (a) Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).
Question 33.
Assertion: The complex [Co(NH3)4Cl2]Cl gives precipitates corresponding to 2 mol of AgCl with AgNO3 solutions.
Reason: It ionises as [Co(NH3)4Cl2]+ + Cl–.
Answer
Answer: (d) Assertion (A) is wrong, but Reason (R) is correct statement.
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