Multiple choice

Which one of the following gases is used for the purification of water?

  1. oxygen

  2. ammonia

  3. chlorine

  4. carbon dioxide
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Chlorine is widely used for water purification because it effectively kills bacteria, viruses, and other microorganisms. It acts as a strong disinfectant that prevents waterborne diseases and provides residual protection in distribution systems. Oxygen, ammonia, and carbon dioxide do not have disinfectant properties suitable for water treatment.

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