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Chemical Equilibrium WBJEE MCQ & Practice Questions

Practice Chemical Equilibrium MCQs for WBJEE Chemistry with answers, explanations, chapter revision and related ChemNexa mock tests.

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Chemical Equilibrium Revision Guide for WBJEE Chemistry

Chemical Equilibrium is part of WBJEE Chemistry preparation. A strong revision plan should combine concept review with exam-style questions so that definitions, relationships, calculations and exceptions are recalled accurately.

Use the sample MCQs on this page to check understanding, then attempt the related ChemNexa tests for broader practice. When an answer is wrong, review the explanation and return to the underlying concept before attempting another set.

Important Topics

  • Core definitions and principles
  • Important equations or relationships
  • Common applications and examples
  • Frequently confused concepts
  • Exam-style multiple-choice questions
  • Error review and targeted revision

Revision Tip

Create a one-page summary of trends, structures, reactions, exceptions and key terminology for Chemical Equilibrium, then test recall with mixed MCQs.

What to practise in Chemical Equilibrium

Concept Revision

Revise definitions, principles, equations, trends and core ideas from Chemical Equilibrium before attempting MCQs.

Exam-style MCQs

Use chapter-focused multiple-choice practice to improve accuracy, recall and application for WBJEE Chemistry.

Performance Practice

Attempt ChemNexa tests, review results and return to weak areas for another round of targeted revision.

Top 20 Chemical Equilibrium MCQs with Answers

These public questions are selected from the exact Chemical Equilibrium chapter, screened for topic relevance and deduplicated so repeated versions of the same MCQ are not shown publicly. Use them for quick revision, then sign in to attempt the complete test experience with more questions, results and performance review.

WBJEE Chemistry · Chemical Equilibrium · Very Very Hard

1. Which fundamental condition must be respected in solving Chemical Equilibrium 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 · Chemical Equilibrium · Very Very Hard

2. At dynamic equilibrium relevant to Chemical Equilibrium

  • 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 · Chemical Equilibrium · 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 · Chemical Equilibrium · Very Very Hard

4. A catalyst in Chemical Equilibrium 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 · Chemical Equilibrium · 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 · Chemical Equilibrium · 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 · Chemical Equilibrium · 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 · Chemical Equilibrium · 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 · Chemical Equilibrium · 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 · Chemical Equilibrium · 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 · Chemical Equilibrium · 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 · Chemical Equilibrium · Very Very Hard

12. Arrhenius equation is

  • A. k=A/RT
  • B. k=Ae^(-Ea/RT)
  • C. k=Ae^(Ea/RT)
  • D. k=EaRT
Answer: B
Explanation: Arrhenius equation relates k, Ea and T.

WBJEE Chemistry · Chemical Equilibrium · Very Very Hard

13. 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 · Chemical Equilibrium · Very Very Hard

14. 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 · Chemical Equilibrium · Very Very Hard

15. 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 · Chemical Equilibrium · Very Very Hard

16. 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 · Chemical Equilibrium · Very Very Hard

17. 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 · Chemical Equilibrium · Very Very Hard

18. 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 · Chemical Equilibrium · Very Very Hard

19. 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 · Chemical Equilibrium · Very Very Hard

20. A nucleophile is

  • A. Always radical
  • B. Electron-pair donor
  • C. Electron-pair acceptor
  • D. Always positive
Answer: B
Explanation: Nucleophiles donate electron pairs.

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Chemical Equilibrium Practice Tests

Chemical Equilibrium Frequently Asked Questions

How should I prepare Chemical Equilibrium for WBJEE Chemistry?

Revise the core concepts first, make a short list of important relationships or exceptions, and then solve chapter-focused MCQs while reviewing every error.

How can ChemNexa help with Chemical Equilibrium practice?

This page provides public sample questions and links to published ChemNexa tests so you can combine quick revision with structured practice.

What should I do after getting an MCQ wrong?

Identify whether the mistake came from a concept gap, calculation, unit, sign, wording or memory error, review that point, and then attempt a similar question again.

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

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