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Which of the following statements regarding micelles are correct? (A) Micelle formation leads to a net increase in entropy of the system. (B) Hydrophobic portions of the surfactant molecules are oriented inward within the micelle cluster, while hydrophilic portions are exposed to the aqueous phase. (C) After the critical micelle concentration (CMC) is reached, the surface tension does not change further because the surface is fully loaded with surfactant molecules and any additional surfactant forms only micelles. (D) Micelles are dynamic structures — surfactant molecules constantly leave and re-enter the micelle from the bulk solution.

1. A, B and C only
2. B, C and D only
3. A, C and D only
4. A, B, C and D

Correct answer: A, B, C and D

Solution

All four statements A, B, C, and D correctly describe the properties and behaviour of micelles. The hydrophobic effect driving micelle formation does increase overall entropy (by releasing ordered water molecules). The amphiphilic structure dictates that hydrophobic tails cluster inward and hydrophilic heads face water. Surface tension plateaus at CMC as the interface is saturated. Micelle formation is reversible and dynamic at equilibrium.

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