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Which of the following forms cationic micelles above certain concentration?

1. Sodium dodecyl sulphate
2. Sodium acetate
3. Urea
4. Cetyl trimethyl ammonium bromide

Correct answer: Cetyl trimethyl ammonium bromide

Solution

Cetyl trimethyl ammonium bromide is a cationic surfactant that forms cationic micelles above its critical micelle concentration (CMC). The other options do not form cationic micelles.

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