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Coordination Compounds WBJEE MCQ & Practice Questions

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Coordination Compounds Revision Guide for WBJEE Chemistry

Coordination Compounds combines nomenclature, bonding, geometry, isomerism and magnetic behaviour. The chapter becomes much easier when oxidation state, coordination number and ligand type are identified before attempting the rest of a problem.

For WBJEE Chemistry, practise IUPAC naming, Werner concepts, isomerism, crystal field splitting, spin state and magnetic moment.

Important Topics

  • Ligands and coordination number
  • IUPAC nomenclature
  • Oxidation state and effective atomic number concepts
  • Structural and stereoisomerism
  • Crystal field splitting
  • Magnetic behaviour and colour

Important Formulae & Relationships

  • Magnetic moment μ = √(n(n+2)) BM
  • Oxidation state + ligand charges = charge on complex

Use formulas only after checking the required units, sign convention and assumptions for the question.

What to practise in Coordination Compounds

Concept Revision

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Exam-style MCQs

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Performance Practice

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Top 20 Coordination Compounds MCQs with Answers

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WBJEE Chemistry · Coordination Compounds · Very Very Hard

1. Chelating ligands generally form complexes that are:

  • A. More stable than analogous monodentate-ligand complexes
  • B. Less stable always
  • C. Unable to form rings
  • D. Always neutral
Answer: A
Explanation: The chelate effect enhances thermodynamic stability.

WBJEE Chemistry · Coordination Compounds · Very Very Hard

2. A chelating ligand binds through:

  • A. Exactly one donor atom
  • B. No donor atoms
  • C. Only ionic attraction
  • D. Two or more donor atoms
Answer: D
Explanation: Multidentate attachment forms one or more chelate rings.

WBJEE Chemistry · Coordination Compounds · Very Very Hard

3. The spectrochemical series orders ligands by:

  • A. Number of atoms
  • B. Crystal-field splitting strength
  • C. Molar mass only
  • D. Ligand charge only
Answer: B
Explanation: Ligands are ranked according to the Δ they produce.

WBJEE Chemistry · Coordination Compounds · Very Very Hard

4. Coordination concept check: Chelating ligands generally form complexes that are:

  • A. Unable to form rings
  • B. Always neutral
  • C. More stable than analogous monodentate-ligand complexes
  • D. Less stable always
Answer: C
Explanation: The chelate effect enhances thermodynamic stability.

WBJEE Chemistry · Coordination Compounds · Very Very Hard

5. Coordination concept check: A chelating ligand binds through:

  • A. Only ionic attraction
  • B. Two or more donor atoms
  • C. Exactly one donor atom
  • D. No donor atoms
Answer: B
Explanation: Multidentate attachment forms one or more chelate rings.

WBJEE Chemistry · Coordination Compounds · Very Very Hard

6. Coordination concept check: The spectrochemical series orders ligands by:

  • A. Molar mass only
  • B. Ligand charge only
  • C. Number of atoms
  • D. Crystal-field splitting strength
Answer: D
Explanation: Ligands are ranked according to the Δ they produce.

WBJEE Chemistry · Coordination Compounds · Very Very Hard

7. NO2- can show linkage isomerism because it can bind through:

  • A. Two metals only
  • B. N or O
  • C. Only N
  • D. Only O
Answer: B
Explanation: Nitrite is an ambidentate ligand.

WBJEE Chemistry · Coordination Compounds · Very Very Hard

8. The coordination number of Pt in

  • A. 2
  • B. 6
  • C. 8
  • D. 4
Answer: D
Explanation: Four chloride ligands coordinate to Pt.

WBJEE Chemistry · Coordination Compounds · Very Very Hard

9. The coordination number of Ni in

  • A. 6
  • B. 8
  • C. 4
  • D. 2
Answer: C
Explanation: Four CO ligands bind to nickel.

WBJEE Chemistry · Coordination Compounds · Very Very Hard

10. According to Werner's theory, primary valency corresponds mainly to:

  • A. Atomic number
  • B. Oxidation state
  • C. Coordination number
  • D. Number of ligands outside sphere
Answer: B
Explanation: Primary valency is ionisable and corresponds to oxidation state.

WBJEE Chemistry · Coordination Compounds · Very Very Hard

11. Geometrical isomerism is common in:

  • A. Only linear complexes
  • B. All monatomic ions
  • C. Square-planar and octahedral complexes
  • D. Only tetrahedral MA4 complexes
Answer: C
Explanation: Different relative positions of ligands can occur in these geometries.

WBJEE Chemistry · Coordination Compounds · Very Very Hard

12. cis-

  • A. Ionisation isomers
  • B. Geometrical isomers
  • C. Optical isomers
  • D. Linkage isomers
Answer: B
Explanation: They differ in relative ligand positions.

WBJEE Chemistry · Coordination Compounds · Very Very Hard

13. Coordination isomerism is possible when:

  • A. Only one simple ion is present
  • B. No metal is present
  • C. All ligands are identical
  • D. Both cation and anion are complex ions
Answer: D
Explanation: Ligands can be redistributed between complex cation and complex anion.

WBJEE Chemistry · Coordination Compounds · Very Very Hard

14. In octahedral crystal-field splitting, the upper set is:

  • A. 4s
  • B. all remain degenerate
  • C. eg
  • D. t2g
Answer: C
Explanation: dx2-y2 and dz2 point directly toward ligands and form the upper eg set.

WBJEE Chemistry · Coordination Compounds · Very Very Hard

15. The tetrahedral splitting magnitude is approximately:

  • A. 4/9 of octahedral splitting for similar ligands
  • B. Equal to octahedral splitting
  • C. Twice octahedral splitting
  • D. Zero
Answer: A
Explanation: For comparable metal-ligand systems, Δt≈4/9 Δo.

WBJEE Chemistry · Coordination Compounds · Very Very Hard

16. Strong-field ligands tend to favour:

  • A. Maximum unpairing always
  • B. No splitting
  • C. Only tetrahedral geometry
  • D. Electron pairing and low spin
Answer: D
Explanation: When Δ exceeds pairing energy, electrons pair in lower orbitals.

WBJEE Chemistry · Coordination Compounds · Very Very Hard

17. Weak-field ligands tend to favour:

  • A. Complete pairing
  • B. No d electrons
  • C. High-spin configurations
  • D. Low-spin configurations always
Answer: C
Explanation: Small splitting makes occupation of higher orbitals energetically preferable to pairing.

WBJEE Chemistry · Coordination Compounds · Very Very Hard

18. Coordination concept check: NO2- can show linkage isomerism because it can bind through:

  • A. Only N
  • B. Only O
  • C. Two metals only
  • D. N or O
Answer: D
Explanation: Nitrite is an ambidentate ligand.

WBJEE Chemistry · Coordination Compounds · Very Very Hard

19. Coordination concept check: The coordination number of Pt in

  • A. 8
  • B. 4
  • C. 2
  • D. 6
Answer: B
Explanation: Four chloride ligands coordinate to Pt.

WBJEE Chemistry · Coordination Compounds · Very Very Hard

20. Coordination concept check: The coordination number of Ni in

  • A. 4
  • B. 2
  • C. 6
  • D. 8
Answer: A
Explanation: Four CO ligands bind to nickel.

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Coordination Compounds Practice Tests

Coordination Compounds Frequently Asked Questions

What should I identify first in a coordination complex?

Find the overall charge, ligand charges, oxidation state of the metal and coordination number. These determine many later steps.

How should I learn coordination nomenclature?

Apply the naming order consistently: ligands first, metal second, oxidation state in Roman numerals, and special metal endings for anionic complexes.

Why are unpaired electrons important?

The number of unpaired electrons determines magnetic behaviour and is closely related to crystal-field splitting and high-spin or low-spin configurations.

Continue with another chapter to build connected concepts and strengthen your overall Chemistry preparation.

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