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Surfactants, having both cationic and anionic centres attached to the same molecule, are called:

1. cationic surfactant
2. anionic surfactant
3. zwitter-ionic surfactants
4. neutral surfactants

Correct answer: zwitter-ionic surfactants

Solution

Surfactants that contain both cationic and anionic centers in the same molecule are called zwitter-ionic surfactants. They are electrically neutral overall but have separated positive and negative charges within the same structure.

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