Question

For micelle formation, which of the following statements are correct?

1. Micelle formation is an exothermic process.
2. Micelle formation is an endothermic process.
3. The entropy change is positive.
4. The entropy change is negative.

Options

• A and D only

• A and C only

• B and C only

• B and D only

Answer 1

B and C only

Explanation:

For micelle formation, ΔS > 0 (hydrophobic effect) This is possible because the decrease in entropy due to clustering is offset by an increase in entropy due to desolvation of the surfactant. Also, ΔH > 0.