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)

Colloidal solution freezes at higher temperature than the true solution at the same concentration.

Answer 2

(a) The statement is False. Peptization refers to the process of converting a precipitate into a colloidal sol, not the other way around.

(b) The statement is True. Colloidal solutions exhibit colligative properties such as higher freezing point compared to true solutions at the same concentration due to the presence of dispersed particles.

(c) The statement is True. Surfactants form micelles above the critical micelle concentration (CMC), and CMC can indeed depend on temperature.

(d) The statement is False. Micelles are not macromolecular colloids; they are associated colloids formed by the aggregation of amphiphilic molecules in a solvent.