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Problem 4 - Olympiad
The critical micelle concentration (CMC) of a surfactant decreases as:
A. Temperature increases
B. Surfactant concentration increases
C. The length of the hydrophobic chain increases
D. Ionic strength of the solution decreases
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Correct: C
Longer hydrophobic chains stabilize micelles at lower concentrations, reducing the CMC. Temperature and ionic strength have inverse effects.