Multiple choice general knowledge

Which of the following gases is used for 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 and disinfection because it effectively kills bacteria, viruses, and other pathogens. It is added to water supplies in controlled amounts to make water safe for drinking. Oxygen and carbon dioxide are not used for purification, while ammonia is sometimes used in water treatment but not as a disinfectant.

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