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JEE Main Chemistry: Physisorption and Chemisorption Practice Questions

3 free multiple-choice questions on Physisorption and Chemisorption (Surface Chemistry) for JEE Main Chemistry, each with the correct answer and a step-by-step explanation. Attempt a question, then reveal the solution to check your reasoning.

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  1. Q1. In chemisorption, the adsorbed molecules typically form:

    • APhysical layers only.
    • BWeak temporary associations.
    • CStrong chemical bonds with the surface.
    • DOnly hydrogen bonds.
    Show answer & explanation

    Correct answer: C — Strong chemical bonds with the surface.

    Chemisorption is characterized by the formation of chemical bonds (covalent or ionic) between the adsorbate and the surface, leading to a higher energy release.

  2. Q2. What is the primary characteristic that distinguishes chemisorption from physisorption?

    • APhysisorption is always reversible while chemisorption is irreversible
    • BChemisorption occurs only on porous surfaces while physisorption does not
    • CChemisorption is always exothermic while physisorption is always endothermic
    • DChemisorption involves chemical bond formation while physisorption involves weak intermolecular forces
    Show answer & explanation

    Correct answer: D — Chemisorption involves chemical bond formation while physisorption involves weak intermolecular forces

    The key difference lies in the nature of interaction: chemisorption involves chemical bond formation, whereas physisorption involves weak physical forces.

  3. Q3. Which of the following is generally true regarding physisorption?

    • AIt is reversible and involves weak forces
    • BIt is highly specific and directional
    • CIt is irreversible and involves covalent bonding
    • DIt is exothermic and involves bond formation
    Show answer & explanation

    Correct answer: A — It is reversible and involves weak forces

    Physisorption is characterized by weak forces (van der Waals), is reversible, and involves low energy release.

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