JEE Advance - Chemistry (2021 - Paper 1 Online - No. 13)
The correct statement(s) related to colloids is (are)
The process of precipitating colloidal sol by an electrolyte is called peptization.
Colloidal solution freezes at higher temperature than the true solution at the same concentration.
Surfactants form micelle above critical micelle concentration (CMC). CMC depends on temperature.
Micelles are macromolecular colloids.
Explanation
Statements (b) and (c) are correct whereas statements (a) and (d) are incorrect.
(a) Process of precipitating colloidal sol is known as coagulation.
(b) Concentration of colloidal solutions is small due to large molar mass and thus, their colligative properties are very small compared to true solutions. Hence, these solution freezes at higher temperature.
(c) Micelles are formed at the critical micelle concentration (CMC) which depends to temperature.
(d) Micelles and macromolecular colloids are two different types of colloid.
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