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Quantum Numbers and Electronic Configuration WBJEE MCQ & Practice Questions

Practice Quantum Numbers and Electronic Configuration MCQs for WBJEE Chemistry with answers, explanations, chapter revision and related ChemNexa mock tests.

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Quantum Numbers and Electronic Configuration Revision Guide for WBJEE Chemistry

Quantum Numbers and Electronic Configuration 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 Quantum Numbers and Electronic Configuration, then test recall with mixed MCQs.

What to practise in Quantum Numbers and Electronic Configuration

Concept Revision

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Exam-style MCQs

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Performance Practice

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Top 20 Quantum Numbers and Electronic Configuration MCQs with Answers

These public questions are selected from the exact Quantum Numbers and Electronic Configuration 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 · Quantum Numbers and Electronic Configuration · Very Very Hard

1. Which fundamental condition must be respected in solving Quantum Numbers and Electronic Configuration problems?

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

WBJEE Chemistry · Quantum Numbers and Electronic Configuration · Very Very Hard

2. At dynamic equilibrium relevant to Quantum Numbers and Electronic Configuration:

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

WBJEE Chemistry · Quantum Numbers and Electronic Configuration · Very Very Hard

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

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

WBJEE Chemistry · Quantum Numbers and Electronic Configuration · Very Very Hard

4. A catalyst in Quantum Numbers and Electronic Configuration generally:

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

WBJEE Chemistry · Quantum Numbers and Electronic Configuration · Very Very Hard

5. Oxidation means:

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

WBJEE Chemistry · Quantum Numbers and Electronic Configuration · Very Very Hard

6. Reduction means:

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

WBJEE Chemistry · Quantum Numbers and Electronic Configuration · Very Very Hard

7. A Lewis acid is:

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

WBJEE Chemistry · Quantum Numbers and Electronic Configuration · Very Very Hard

8. A Lewis base is:

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

WBJEE Chemistry · Quantum Numbers and Electronic Configuration · Very Very Hard

9. Which is a state function?

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

WBJEE Chemistry · Quantum Numbers and Electronic Configuration · Very Very Hard

10. The correct relation is:

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

WBJEE Chemistry · Quantum Numbers and Electronic Configuration · Very Very Hard

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

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

WBJEE Chemistry · Quantum Numbers and Electronic Configuration · Very Very Hard

12. Arrhenius equation is:

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

WBJEE Chemistry · Quantum Numbers and Electronic Configuration · Very Very Hard

13. 0.20 mol solute in 0.50 L solution has molarity:

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

WBJEE Chemistry · Quantum Numbers and Electronic Configuration · Very Very Hard

14. For a weak acid, larger Ka means:

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

WBJEE Chemistry · Quantum Numbers and Electronic Configuration · Very Very Hard

15. At 25°C:

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

WBJEE Chemistry · Quantum Numbers and Electronic Configuration · Very Very Hard

16. Oxidation in an electrochemical cell occurs at:

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

WBJEE Chemistry · Quantum Numbers and Electronic Configuration · Very Very Hard

17. Reduction in an electrochemical cell occurs at:

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

WBJEE Chemistry · Quantum Numbers and Electronic Configuration · Very Very Hard

18. Positive E°cell implies:

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

WBJEE Chemistry · Quantum Numbers and Electronic Configuration · Very Very Hard

19. Higher bond order generally gives:

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

WBJEE Chemistry · Quantum Numbers and Electronic Configuration · Very Very Hard

20. A nucleophile is:

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

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Quantum Numbers and Electronic Configuration Practice Tests

Quantum Numbers and Electronic Configuration Frequently Asked Questions

How should I prepare Quantum Numbers and Electronic Configuration 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 Quantum Numbers and Electronic Configuration 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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