Gas used for sterilizing water is:

A) SO₂

B) CO₂

C) O3

D) NH₃

Dear student 

Ozone  is an excellent disinfectant with the superior ability to kill viruses and biological contaminants found in water. It is also a very powerful oxidant that can oxidize metals in water such as manganese, iron, and sulfur into insoluble particles, aiding in their filtration and removal from water