JEE Advanced 2021 Chemistry question

The correct statement(s) related to colloids is(are)

(A)The process of precipitating colloidal sol by an electrolyte is called peptization.
(B)Colloidal solution freezes at higher temperature than the true solution at the same concentration.Correct
(C)Surfactants form micelle above critical micelle concentration (CMC). CMC depends on temperature.Correct
(D)Micelles are macromolecular colloids.

Answer: (B),(C)

Solution

(A) Precipitation of a sol by an electrolyte is coagulation; peptization is the reverse process (converting a precipitate into a colloidal sol with a peptizing agent) – incorrect. (B) At the same mass concentration a colloidal sol contains far fewer particles (very large particle mass), so its freezing-point

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Question ID VK-033871