Chapter Exam

Chapter 5: Coordination Chemistry — Online MCQ Test

Q: What is the coordination number of the central metal ion in the complex [Co(NH3)6]3+ ?

Answer: C. 6 — There are six ammonia ligands directly bonded to cobalt. Hence, the coordination number is 6.

Q: Which of the following is a neutral ligand?

Answer: B. NH3 — Ammonia (NH3) is a neutral ligand because it does not carry a charge.

Q: Which complex will have the highest crystal field splitting energy (Δo) among the following?

Answer: C. [Co(H2O)6]2+ — For the same ligand, crystal field splitting generally increases with higher charge and smaller ionic radius of the metal ion. Co2+ gives a larger splitting than the others listed here.

Q: Which complex is most likely to violate the simple valence bond theory prediction of magnetic behavior?

Answer: A. [FeF6]3− — [FeF6]3− contains Fe(III) with weak-field fluoride ligands and is high-spin paramagnetic. It is commonly used in questions involving magnetic properties and crystal field considerations.

CHEMISTRY · CLASS 12th · Tamil Nadu State Board

Practice Chapter 5: Coordination Chemistry with a free chapter-wise online MCQ test for Tamil Nadu State Board CLASS 12th CHEMISTRY. This chapter covers: This chapter introduces coordination compounds ligands coordination numbers and IUPAC nomenclature. It covers Werner theory valence bond theory crystal field splitting and isomeris.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 5: Coordination Chemistry — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board CLASS 12th CHEMISTRY — Chapter 5: Coordination Chemistry, with answers and explanations. These are sample questions; the exam has its own separate question set.

What is the coordination number of the central metal ion in the complex [Co(NH3)6]3+ ?

A. 3
B. 4
C. 6 ✓
D. 2

Answer: C. 6
There are six ammonia ligands directly bonded to cobalt. Hence, the coordination number is 6.

Which of the following is a neutral ligand?

A. Cl−
B. NH3 ✓
C. CN−
D. OH−

Answer: B. NH3
Ammonia (NH3) is a neutral ligand because it does not carry a charge.

Which statement best describes Werner’s theory?

A. Metal ions form only ionic bonds with ligands
B. Primary valence is ionisable and secondary valence is non-ionisable ✓
C. Coordination compounds cannot show isomerism
D. Ligands are always negatively charged

Answer: B. Primary valence is ionisable and secondary valence is non-ionisable
Werner proposed that primary valence corresponds to oxidation state and is ionisable, while secondary valence corresponds to coordination number and is non-ionisable.

Which complex will have the highest crystal field splitting energy (Δo) among the following?

A. [Ti(H2O)6]3+
B. [Fe(H2O)6]2+
C. [Co(H2O)6]2+ ✓
D. [Ni(H2O)6]2+

Answer: C. [Co(H2O)6]2+
For the same ligand, crystal field splitting generally increases with higher charge and smaller ionic radius of the metal ion. Co2+ gives a larger splitting than the others listed here.

Which complex is most likely to violate the simple valence bond theory prediction of magnetic behavior?

A. [FeF6]3− ✓
B. [Fe(CN)6]3−
C. [CoF6]3−
D. [NiCl4]2−

Answer: A. [FeF6]3−
[FeF6]3− contains Fe(III) with weak-field fluoride ligands and is high-spin paramagnetic. It is commonly used in questions involving magnetic properties and crystal field considerations.

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