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Surface Chemistry WBJEE MCQ & Practice Questions

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

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Surface Chemistry Revision Guide for WBJEE Chemistry

Surface Chemistry 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 Surface Chemistry, then test recall with mixed MCQs.

What to practise in Surface Chemistry

Concept Revision

Revise definitions, principles, equations, trends and core ideas from Surface Chemistry 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 Surface Chemistry MCQs with Answers

These public questions are selected from the exact Surface Chemistry 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 · Surface Chemistry · Very Very Hard

1. Adsorption is the accumulation of a substance primarily at:

  • A. The atomic nucleus
  • B. Only the gas phase
  • C. A surface or interface
  • D. The entire bulk uniformly
Answer: C
Explanation: Adsorption is a surface phenomenon.

WBJEE Chemistry · Surface Chemistry · Very Very Hard

2. The substance accumulated on a surface is called the:

  • A. Solvent
  • B. Adsorbate
  • C. Adsorbent
  • D. Catalyst
Answer: B
Explanation: The adsorbate is the species being adsorbed.

WBJEE Chemistry · Surface Chemistry · Very Very Hard

3. The material on whose surface adsorption occurs is the:

  • A. Adsorbent
  • B. Adsorbate
  • C. Solute only
  • D. Emulsion
Answer: A
Explanation: The adsorbent provides the surface.

WBJEE Chemistry · Surface Chemistry · Very Very Hard

4. Absorption differs from adsorption because absorption occurs mainly in the:

  • A. Surface only
  • B. Gas-solid interface only
  • C. Catalyst surface only
  • D. Bulk of the material
Answer: D
Explanation: Absorption is a bulk phenomenon.

WBJEE Chemistry · Surface Chemistry · Very Very Hard

5. Physisorption is caused mainly by:

  • A. Nuclear forces
  • B. Metallic bonds only
  • C. van der Waals forces
  • D. Strong covalent bonds only
Answer: C
Explanation: Physical adsorption involves weak intermolecular forces.

WBJEE Chemistry · Surface Chemistry · Very Very Hard

6. Chemisorption involves formation of:

  • A. Nuclear bonds
  • B. Chemical bonds with the surface
  • C. Only weak dispersion forces
  • D. No interaction
Answer: B
Explanation: Chemisorption involves stronger, specific surface bonding.

WBJEE Chemistry · Surface Chemistry · Very Very Hard

7. Physisorption is generally:

  • A. Reversible
  • B. Always irreversible
  • C. Independent of pressure
  • D. Highly specific
Answer: A
Explanation: Weak interactions make physical adsorption readily reversible.

WBJEE Chemistry · Surface Chemistry · Very Very Hard

8. Chemisorption is generally more:

  • A. Non-specific
  • B. Independent of adsorbent
  • C. Reversible at all temperatures
  • D. Specific
Answer: D
Explanation: Chemical bonding depends strongly on adsorbate and surface identities.

WBJEE Chemistry · Surface Chemistry · Very Very Hard

9. Physisorption is generally favoured by:

  • A. Low pressure only
  • B. Very high temperature
  • C. Low temperature and high pressure
  • D. High temperature and low pressure
Answer: C
Explanation: Lower temperature favours exothermic adsorption and high pressure increases surface coverage.

WBJEE Chemistry · Surface Chemistry · Very Very Hard

10. Chemisorption often initially increases with temperature because:

  • A. Surface area disappears
  • B. Activation energy may be required
  • C. It is always endothermic
  • D. Pressure becomes zero
Answer: B
Explanation: Chemical bond formation may require an activation barrier to be crossed.

WBJEE Chemistry · Surface Chemistry · Very Very Hard

11. Adsorption is generally accompanied by:

  • A. Decrease in surface free energy
  • B. Increase in surface free energy only
  • C. No energy change
  • D. Nuclear decay
Answer: A
Explanation: Adsorption reduces unsatisfied surface forces.

WBJEE Chemistry · Surface Chemistry · Very Very Hard

12. For spontaneous adsorption at constant T and P, ΔG is:

  • A. Positive
  • B. Always zero
  • C. Infinite
  • D. Negative
Answer: D
Explanation: Spontaneous adsorption requires ΔG<0.

WBJEE Chemistry · Surface Chemistry · Very Very Hard

13. Adsorption is commonly exothermic, so ΔH is generally:

  • A. Zero always
  • B. Undefined
  • C. Negative
  • D. Positive
Answer: C
Explanation: Formation of adsorbate-surface interactions releases energy.

WBJEE Chemistry · Surface Chemistry · Very Very Hard

14. During adsorption, entropy of the adsorbate generally:

  • A. Becomes infinite
  • B. Decreases
  • C. Increases greatly
  • D. Remains exactly constant
Answer: B
Explanation: Adsorbed particles have less translational freedom.

WBJEE Chemistry · Surface Chemistry · Very Very Hard

15. Increasing surface area of an adsorbent generally:

  • A. Increases adsorption
  • B. Decreases adsorption
  • C. Has no effect
  • D. Stops adsorption
Answer: A
Explanation: More surface provides more adsorption sites.

WBJEE Chemistry · Surface Chemistry · Very Very Hard

16. Finely divided solids are good adsorbents because they have:

  • A. Low surface area
  • B. No pores
  • C. No surface energy
  • D. Large surface area
Answer: D
Explanation: High specific surface area provides many active sites.

WBJEE Chemistry · Surface Chemistry · Very Very Hard

17. Activated charcoal is effective as an adsorbent because of its:

  • A. Metallic bonding
  • B. Complete nonporosity
  • C. High porosity and surface area
  • D. High density only
Answer: C
Explanation: Its porous structure gives a very large internal surface.

WBJEE Chemistry · Surface Chemistry · Very Very Hard

18. Freundlich adsorption isotherm is commonly written as:

  • A. x/m = nP^2
  • B. x/m = kP^(1/n)
  • C. x/m = k/P
  • D. x/m = P/k only
Answer: B
Explanation: The empirical Freundlich relation connects amount adsorbed with pressure.

WBJEE Chemistry · Surface Chemistry · Very Very Hard

19. Taking logarithms of Freundlich equation gives a plot of log(x/m) versus log P with slope:

  • A. 1/n
  • B. n
  • C. k
  • D. -n
Answer: A
Explanation: log(x/m)=log k+(1/n)log P.

WBJEE Chemistry · Surface Chemistry · Very Very Hard

20. At very high pressure, the Freundlich equation becomes limited because it does not explicitly predict:

  • A. Any adsorption
  • B. Temperature dependence
  • C. Adsorbent mass
  • D. Surface saturation
Answer: D
Explanation: Real surfaces have finite adsorption capacity.

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Surface Chemistry Practice Tests

Surface Chemistry Frequently Asked Questions

How should I prepare Surface Chemistry 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 Surface Chemistry 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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