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Surface Chemistry question

2012 · Shift 1 · Q4
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Surface Chemistry question

2012 · Shift 1 · Q4

JEE AdvancedChemistrySurface ChemistryMultiple correct+2 / −0.5
Choose the correct reason for the stability of the Iyophobic colloidal particles
  1. A
    Preferential adsorption of ions on their surface from the solution
  2. B
    Preferential adsorption of solvent on their surface from the solution
  3. C
    Attraction between different particles having opposite charges on their surface
  4. D
    Potential difference between the fixed layer and the diffused layer of opposite charges around the colloidal particles.
View written solutionFree

Correct answer: A, D

  1. Key idea: stability of lyophobic colloids

    Lyophobic colloidal particles are generally stabilized by electrical charge on their surface. Because all particles acquire the same type of charge, they repel one another and do not coagulate easily.

  2. How do lyophobic colloidal particles get this charge?

    They usually acquire charge due to preferential adsorption of ions from the dispersion medium on their surface.

    Hence, Option A is correct.

  3. Role of electric double layer

    Around a charged colloidal particle, an electric double layer is formed:

    • a fixed layer of adsorbed ions,
    • a diffuse layer of oppositely charged ions.

    The potential difference between these layers is called the electrokinetic potential or zeta potential. This potential is responsible for repulsion between similarly charged particles and thus for colloidal stability.

    Hence, Option D is correct.

  4. Why the other options are incorrect

    • Option B: Preferential adsorption of solvent does not generally explain the stability of lyophobic sols. Solvent adsorption is more relevant to solvation/hydration effects, not the primary cause of stability here.
    • Option C: Attraction between oppositely charged particles would promote coagulation, not stability.

  5. Final answer

    The correct reasons are: A,D\boxed{A, D}A,D​

  6. Comparison with stored correct answer

    Stored correct answer: A, D

    My derived answer matches the stored answer.

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