NEET Chemistry · Chapter-wise PYQs

Surface Chemistry NEET PYQs (2005–2026) with Solutions

Surface Chemistry has appeared in 8 of the 22 NEET and AIPMT papers from 2005 to 2026, with 10 questions in all: about 0.5 per paper on average. The last five papers (2022–2026) had 3 questions from it.

The most-asked topics are Coagulation of Colloids (2), Colloids (2) and Catalysis (1).

Surface Chemistry is not one of the chapters in NEET MIND's map of the current NEET syllabus, so it may no longer be examined; its past questions stay here for practice.

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Free account: 10 PYQs from Surface Chemistry with explanations and progress tracking.

PYQs in this chapter
10
Papers it appeared in
8 of 22
Average per paper
0.5
NEET weightage
Not in syllabus map

10 solved Surface Chemistry PYQs

Real NEET and AIPMT questions from this chapter, newest first. Try each one, then open the answer and the step-by-step explanation.

  1. Question 1 (NEET 2023)

    NEET 2023EasyCatalysis
    Which one is an example of heterogenous catalysis?
    1. Option A: Oxidation of sulphur dioxide into sulphur trioxide in the presence of oxides of nitrogen.
    2. Option B: Hydrolysis of sugar catalysed by H+H^+ ions.
    3. Option C: Decomposition of ozone in presence of nitrogen monoxide.
    4. Option D: Combination between dinitrogen and dihydrogen to form ammonia in the presence of finely divided iron.
    Show answer & explanation

    Correct answer: (D) Combination between dinitrogen and dihydrogen to form ammonia in the presence of finely divided iron.

    Explanation

    In heterogeneous catalysis, the catalyst and reactants are in different phases. In the Haber process, nitrogen and hydrogen are gases while finely divided iron is a solid catalyst. Hence, it is an example of heterogeneous catalysis.

  2. Question 2 (NEET 2023)

    NEET 2023EasyColloids
    Pumice stone is an example of -
    1. Option A: sol
    2. Option B: gel
    3. Option C: solid sol
    4. Option D: foam
    Show answer & explanation

    Correct answer: (C) solid sol

    Explanation

    Pumice stone contains gas dispersed in a solid medium and is classified as a solid foam or solid sol in colloidal systems. According to the given answer key, option (C) is correct.

  3. Question 3 (NEET 2022)

    NEET 2022MediumCoagulation of Colloids
    Given below are two statements: Statement I: In the coagulation of a negative sol, the flocculating power of the three given ions is in the order Al³⁺ > Ba²⁺ > Na⁺ Statement II: In the coagulation of a positive sol, the flocculating power of the three given salts is in the order NaCl > Na₂SO₄ > Na₃PO₄ In the light of the above statements, choose the most appropriate answer from the options given below.
    1. Option A: Statement I is incorrect but Statement II is correct
    2. Option B: Both Statement I and Statement II are correct
    3. Option C: Both Statement I and Statement II are incorrect
    4. Option D: Statement I is correct but Statement II is incorrect
    Show answer & explanation

    Correct answer: (D) Statement I is correct but Statement II is incorrect

    Explanation

    According to Hardy–Schulze rule, greater charge on counter ions gives greater flocculating power. Statement I is correct: Al³⁺ > Ba²⁺ > Na⁺ For positive sols, flocculating power should be: PO₄³⁻ > SO₄²⁻ > Cl⁻ Thus Statement II is incorrect. Hence option (D) is correct.

  4. Question 4 (NEET 2021)

    NEET 2021EasyTyndall Effect in Colloids
    The right option for the statement 'Tyndall effect is exhibited by', is:
    1. Option A: Urea solution
    2. Option B: NaCl solution
    3. Option C: Glucose solution
    4. Option D: Starch solution
    Show answer & explanation

    Correct answer: (D) Starch solution

    Explanation

    Tyndall effect is shown by colloidal solutions. Urea, NaCl, and glucose form true solutions, while starch forms a colloidal solution.

  5. Question 5 (NEET 2020)

    NEET 2020EasyChromatography
    Paper chromatography is an example of
    1. Option A: Adsorption chromatography
    2. Option B: Partition chromatography
    3. Option C: Thin layer chromatography
    4. Option D: Column chromatography
    Show answer & explanation

    Correct answer: (B) Partition chromatography

    Explanation

    In paper chromatography, separation occurs because of partitioning of components between water trapped in the paper and the mobile solvent phase. Therefore, it is an example of partition chromatography.

  6. Question 6 (NEET 2020)

    NEET 2020EasyColloids
    Measuring Zeta potential is useful in determining which property of colloidal solution?
    1. Option A: Viscosity
    2. Option B: Solubility
    3. Option C: Stability of the colloidal particles
    4. Option D: Size of the colloidal particles
    Show answer & explanation

    Correct answer: (C) Stability of the colloidal particles

    Explanation

    Zeta potential gives information about the surface charge on colloidal particles and is used to determine the stability of colloidal systems.

  7. Question 7 (NEET 2018)

    NEET 2018EasyCoagulation of Colloids
    On which of the following properties does the coagulating power of an ion depend?
    1. Option A: The magnitude of the charge on the ion alone
    2. Option B: Size of the ion alone
    3. Option C: The sign of charge on the ion alone
    4. Option D: Both magnitude and sign of the charge on the ion
    Show answer & explanation

    Correct answer: (D) Both magnitude and sign of the charge on the ion

    Explanation

    Coagulation of colloidal solutions by electrolytes depends on the charge present on colloidal particles as well as on the effective ion of the electrolyte. According to the Hardy-Schulze rule, the coagulating power mainly depends on the magnitude of charge of the oppositely charged ion. Hence both magnitude and sign of charge are important.

  8. Question 8 (AIPMT 2014)

    AIPMT 2014EasyProperties of Colloids
    Which property of colloids is not dependent on the charge on colloidal particles?
    1. Option A: Coagulation
    2. Option B: Electrophoresis
    3. Option C: Electro-osmosis
    4. Option D: Tyndall effect
    Show answer & explanation

    Correct answer: (D) Tyndall effect

    Explanation

    Tyndall effect is the scattering of light by colloidal particles and is an optical property. It does not depend on the charge present on colloidal particles, whereas coagulation, electrophoresis and electro-osmosis are charge-dependent phenomena.

  9. Question 9 (AIPMT 2006)

    AIPMT 2006EasyFreundlich Adsorption Isotherm
    A plot of log(x/m) versus log p for the adsorption of a gas on a solid gives a straight line with slope equal to:
    1. Option A: -log k
    2. Option B: n
    3. Option C: 1/n
    4. Option D: log k
    Show answer & explanation

    Correct answer: (C) 1/n

    Explanation

    Freundlich adsorption isotherm is x/m = kp^(1/n). Taking logarithm, log(x/m) = log k + (1/n) log p. Thus the slope of the graph of log(x/m) versus log p is 1/n. Hence option (C) is correct.

  10. Question 10 (AIPMT 2005)

    AIPMT 2005EasyMicelle Formation
    Which one of the following forms micelles in aqueous solution above a certain concentration?
    1. Option A: Urea
    2. Option B: Dodecyl trimethyl ammonium chloride
    3. Option C: Pyridinium chloride
    4. Option D: Glucose
    Show answer & explanation

    Correct answer: (B) Dodecyl trimethyl ammonium chloride

    Explanation

    Micelles are formed by surfactants having both hydrophilic and hydrophobic parts above the critical micelle concentration (CMC). Dodecyl trimethyl ammonium chloride is a cationic surfactant and forms micelles in aqueous solution. Hence option (B) is correct.

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