Question

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

• A. Chloramine
• B. Phenyl
• C. Ozone
• D. Chlorine

Answer 1

The correct option is B Phenyl

Introduction to disinfection of drinking water
Disinfection is the chemical treatment of water that helps in killing the germs. The chemical used for disinfection of water should not be poisonous to humans and must be easily available and effective.

Chlorine
Chlorine is one of the most common disinfectants used for water, because lower levels of chlorine in water do not cause extreme harm to human beings and other organisms.

Ozone
Ozone is a powerful oxidising agent and kills all the microbes present in the water when treated with it.

Chloramine
Chloramine is a chemical variant of chlorine and is also used for disinfection of drinking water.

Phenyl
Phenyl is a disinfectant but it is not used for the disinfection of drinking water as it makes the water poisonous therefore making the water unfit for human consumption.

Final answer
(D)Phenyl