Question
The correct statement s related to colloids is(are)
JEE Advanced
Chemistry
Surface Chemistry
2021
JEE Advanced 2021 (Paper 1)
JEE Advanced Chemistry Question (2021) — Solution
Options
- 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
C. Surfactants form micelle above critical micelle concentration CMC .   CMC depends on temperature.
Step-by-step solution
The process of setting of colloidal particles by adding electrolyte is called coagulation or precipitation of the sol. Peptization is the process of converting a precipitate into colloidal sol by shaking it in a medium in presence of a small amount of electrolyte. Colloidal solution have a lower value of colligative properly so, their depression in freezing point will be low, and freezing point will be higher. Surfactants form micelle above C.M.C and value of CMC depends on temperature. Micelles are not macromolecular colloids they are associated colloids. Since, many small molecules associate with each other to form micelles.
Related: Chemistry — Surface Chemistry · All PYQ Banks