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Which of the following is not used for disinfection of drinking water?

1. Chlorine
2. Ozone
3. Chloramine
4. Phenyl

Correct answer: Phenyl

Solution

Chlorine, ozone, and chloramine are all used to disinfect drinking water by killing or inactivating microorganisms. Phenyl is a household disinfectant, not a drinking-water treatment chemical.

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