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Choose the correct reason(s) for the stability of lyophobic colloidal particles. (A) Preferential adsorption of ions on their surface from the solution (B) Preferential adsorption of solvent on their surface from the solution (C) Attraction between different particles having opposite charges on their surface (D) Potential difference between the fixed layer and the diffused layer of opposite charges around the colloidal particles

1. (A)
2. (B)
3. (C)
4. (D)

Correct answer: (A)

Solution

Lyophobic colloids are stabilised by (A) adsorption of ions giving a surface charge, which creates an electric double layer. Option B applies to lyophilic colloids, C promotes coagulation, and D (zeta potential) is also correct but is a consequence of A. The primary reason is A.

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