Multiple choice general knowledge science & technology

A gas used to purify water is:

  1. O2

  2. CO2

  3. NH3

  4. O3
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Ozone (O3) is a powerful oxidizing agent used in water treatment to kill bacteria, viruses, and other microorganisms. It is more effective than chlorine for some pathogens and leaves no harmful residues. Oxygen (O2) and carbon dioxide (CO2) are not used for purification, and ammonia (NH3) is sometimes used in water treatment but primarily for pH adjustment, not purification.

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