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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

1. a and d only
2. a and c only
3. b and c only
4. b and d only

Correct answer: b and c only

Solution

Micelle formation is driven by the hydrophobic effect: ordered water around the hydrocarbon chains is released, so the entropy change is positive (c) and the process is endothermic (b). Hence b and c only.

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