The correct statement(s) related to colloids is

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Colloidal solution freezes at lower temperature than the true solution at the same concentration

Surfactants form micelle above critical micelle concentration (CMC). CMC depends on temperature

The process of precipitating colloidal sol by an electrolyte is called peptization.

Micelles are macromolecular colloids.

answer is C.

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Detailed Solution

(A) The process of precipitating colloidal solution is called coagulation. Hence false.
(B) For colloidal solutions concentration is very small due to very large molar mass and hence their colligative properties are very small as compared to true solutions $∴ Δ T_{f}$ is lesser for colloidal solution. Hence false.
(C) At CMC surfactant from micelles. Hence true
(D) Micelles and macromolecular colloids are two different types of colloids. Hence false.

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