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Which of the following forms cationic micelles above certain concentration?

1. Sodium acetate
2. Urea
3. cetyl trimethylammonium chloride
4. Sodium dodecyl sulphonate

Correct answer: cetyl trimethylammonium chloride

Solution

Cetyl trimethylammonium chloride is a cationic surfactant; above its critical micelle concentration, its molecules self-assemble into micelles. The other options are not cationic surfactants, so they do not form cationic micelles.

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