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Colloidal Solutions

At CMC critic...

Question

At CMC (critical micelle concentration) the surface molecules:

A

dissociate

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B

associate

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C

become bigger in size due to adsorption

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D

become smaller in size due to decomposition

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Solution

The correct option is C associate
The formation of micelles takes place only above a particular temperature called Kraft temperature and above a particular concentration called critical micelle concentration $(C M C)$ .
At CMC the many surface molecules associate to form a colloid and this is called as Associated colloids.

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