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Coordination Nomenclature and Isomerism WBJEE MCQ & Practice Questions

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Coordination Nomenclature and Isomerism 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 Nomenclature and Isomerism

Concept Revision

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Exam-style MCQs

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Performance Practice

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Top 20 Coordination Nomenclature and Isomerism MCQs with Answers

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WBJEE Chemistry · Coordination Nomenclature and Isomerism · Very Very Hard

1. Which fundamental condition must be respected in solving Coordination Nomenclature and Isomerism problems?

  • A. Conservation of atoms and charge
  • B. Ignore units
  • C. Assume coefficients are one
  • D. Ignore limiting conditions
Answer: A
Explanation: Atom and charge conservation are fundamental.

WBJEE Chemistry · Coordination Nomenclature and Isomerism · Very Very Hard

2. At dynamic equilibrium relevant to Coordination Nomenclature and Isomerism:

  • A. All molecular motion stops
  • B. Concentrations must be equal
  • C. Catalyst is consumed
  • D. Forward and reverse rates are equal
Answer: D
Explanation: At equilibrium forward and reverse rates are equal.

WBJEE Chemistry · Coordination Nomenclature and Isomerism · Very Very Hard

3. At constant T and P a spontaneous process has:

  • A. ΔG=0 always
  • B. ΔH=0
  • C. ΔG<0
  • D. ΔG>0
Answer: C
Explanation: Spontaneity requires ΔG<0.

WBJEE Chemistry · Coordination Nomenclature and Isomerism · Very Very Hard

4. A catalyst in Coordination Nomenclature and Isomerism generally:

  • A. Changes K at fixed T
  • B. Lowers activation energy without changing K at fixed T
  • C. Changes ΔG°
  • D. Changes ΔH
Answer: B
Explanation: Catalysts affect kinetics, not equilibrium thermodynamics.

WBJEE Chemistry · Coordination Nomenclature and Isomerism · Very Very Hard

5. Oxidation means:

  • A. Loss of electrons
  • B. Gain of electrons
  • C. No oxidation-number change
  • D. Gain of protons
Answer: A
Explanation: Oxidation is electron loss.

WBJEE Chemistry · Coordination Nomenclature and Isomerism · Very Very Hard

6. Reduction means:

  • A. Loss of electrons
  • B. Increase in oxidation number
  • C. Loss of protons
  • D. Gain of electrons
Answer: D
Explanation: Reduction is electron gain.

WBJEE Chemistry · Coordination Nomenclature and Isomerism · Very Very Hard

7. A Lewis acid is:

  • A. Always proton donor
  • B. Always anion
  • C. Electron-pair acceptor
  • D. Electron-pair donor
Answer: C
Explanation: Lewis acids accept electron pairs.

WBJEE Chemistry · Coordination Nomenclature and Isomerism · Very Very Hard

8. A Lewis base is:

  • A. Always oxidant
  • B. Electron-pair donor
  • C. Electron-pair acceptor
  • D. Always cation
Answer: B
Explanation: Lewis bases donate electron pairs.

WBJEE Chemistry · Coordination Nomenclature and Isomerism · Very Very Hard

9. Which is a state function?

  • A. Enthalpy
  • B. Heat
  • C. Work
  • D. Path length
Answer: A
Explanation: Enthalpy is a state function.

WBJEE Chemistry · Coordination Nomenclature and Isomerism · Very Very Hard

10. The correct relation is:

  • A. ΔG°=RT lnK
  • B. ΔG°=-KRT
  • C. ΔG°=RT/K
  • D. ΔG°=-RT lnK
Answer: D
Explanation: ΔG°=-RTlnK.

WBJEE Chemistry · Coordination Nomenclature and Isomerism · Very Very Hard

11. For a first-order process, half-life is:

  • A. 1/(k[A]0)
  • B. [A]0/(2k)
  • C. 0.693/k
  • D. k/0.693
Answer: C
Explanation: t1/2=0.693/k.

WBJEE Chemistry · Coordination Nomenclature and Isomerism · Very Very Hard

12. 0.20 mol solute in 0.50 L solution has molarity:

  • A. 0.40 M
  • B. 0.10 M
  • C. 2.50 M
  • D. 0.70 M
Answer: A
Explanation: M=0.20/0.50=0.40 M.

WBJEE Chemistry · Coordination Nomenclature and Isomerism · Very Very Hard

13. For a weak acid, larger Ka means:

  • A. Weaker acid
  • B. No ionisation
  • C. Stronger conjugate acid
  • D. Stronger acid
Answer: D
Explanation: Larger Ka means greater ionisation.

WBJEE Chemistry · Coordination Nomenclature and Isomerism · Very Very Hard

14. At 25°C:

  • A. pH=pOH always
  • B. pH+pOH=1
  • C. pH+pOH=14
  • D. pH+pOH=7
Answer: C
Explanation: pH+pOH=pKw=14.

WBJEE Chemistry · Coordination Nomenclature and Isomerism · Very Very Hard

15. Oxidation in an electrochemical cell occurs at:

  • A. Wire
  • B. Anode
  • C. Cathode
  • D. Salt bridge
Answer: B
Explanation: Oxidation occurs at the anode.

WBJEE Chemistry · Coordination Nomenclature and Isomerism · Very Very Hard

16. Reduction in an electrochemical cell occurs at:

  • A. Cathode
  • B. Anode
  • C. Salt bridge
  • D. Wire
Answer: A
Explanation: Reduction occurs at the cathode.

WBJEE Chemistry · Coordination Nomenclature and Isomerism · Very Very Hard

17. Positive E°cell implies:

  • A. ΔG°>0
  • B. K<1 necessarily
  • C. No spontaneous reaction
  • D. ΔG°<0
Answer: D
Explanation: ΔG°=-nFE°.

WBJEE Chemistry · Coordination Nomenclature and Isomerism · Very Very Hard

18. Higher bond order generally gives:

  • A. Longer stronger bond
  • B. No effect
  • C. Shorter stronger bond
  • D. Longer weaker bond
Answer: C
Explanation: Higher bond order strengthens and shortens bonds.

WBJEE Chemistry · Coordination Nomenclature and Isomerism · Very Very Hard

19. An electrophile is:

  • A. Electron-pair acceptor
  • B. Electron-pair donor
  • C. Always negative
  • D. Always radical
Answer: A
Explanation: Electrophiles accept electron pairs.

WBJEE Chemistry · Coordination Nomenclature and Isomerism · Very Very Hard

20. Inductive effect is transmitted through:

  • A. Pi bonds only
  • B. Hydrogen bonds
  • C. Ionic lattice
  • D. Sigma bonds
Answer: D
Explanation: Inductive effect propagates through sigma bonds.

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Coordination Nomenclature and Isomerism Practice Tests

Coordination Nomenclature and Isomerism 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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