JEE Advanced 2012 Chemistry question

Choose the correct reason(s) for the stability of the **lyophobic** colloidal particles.

(A)Preferential adsorption of ions on their surface from the solutionCorrect
(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 particlesCorrect

Answer: (A),(D)

Solution

Lyophobic sols are stabilised by electric charge. The particles preferentially adsorb a particular kind of ion from the solution (e.g. on ), acquiring the same charge; the like charges repel and prevent coagulation (A true). Around each particle a fixed layer and a diffuse layer

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Question ID VK-026035