For micelle formation, which of the following statements are correct?
(A) Micelle formation is an exothermic process.
(B) Micelle formation is an endothermic process.
(C) The entropy change is positive.
(D) The entropy change is negative.

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B and D only

A and D only

A and C only

B and C only

answer is A.

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Detailed Solution

Micelle formation by many surfactants is endothermic at low temperatures but exothermic at high temperatures.

In the unassociated form, the surfactant molecules are free to roam about in the solution much like normal solutes.But in the form of a micelle , they get associated, grouped into an associated whole,which reduces the freedom of independent movement and should therefore decrease the entropy (randomness) of the system, the entropy change should be negative during micellization

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