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.
• C. Surfactants form micelle above critical micelle concentration (CMC). CMC depends on temperature.
• D. Micelles are macromolecular colloids.

Answer 1

Answer: (B), (C)

(A) Process of precipitating colloidal solution by using an electrolyte is called "COAGULATION" and not peptisation.
(B) Since, molar mass of sol is much higher than true solutions, so magnitude of any colligative properties is smaller than true solutions.
${\left(\Delta T_f\right)}_{\text{sol }}<{\left(\Delta T_f\right)}_{\text{true solution }}$
So, freezing point of sols $>$ freezing point of true solution.
So, option (B) is correct.
(C) Micells are formed greater than or equal to CMC and above KRAFT temperature.
So option (C) is also correct.
(D) Micelles are ASSOCIATED colloids and not Macromolecular colloids.