Question

The substance used for disinfecting water is/ are

• A. Ozone
• B. Chlorine
• C. U.V rays
• D. All of these

Answer 1

The correct option is B

Chlorine

The correct option is B.

Explanation for correct answer:

1. Chlorination is a method that is used to disinfect water in which chlorine is added to the water.
2. The chlorine kills the disease-causing micro-organisms like bacteria, viruses and parasites.

Explanation for incorrect answers:

Option A:

Ozone or O₃ is a highly reactive gas that forms a layer in the stratosphere and helps in absorbing harmful gases that are emitted by the sun.

Option C:

U.V rays are a form of non-ionizing radiation that is emitted from the sun and gets absorbed by the ozone but some of it enters the Earth's atmosphere which causes harm to plants, animals as well as humans.

Final answer:

The substance used for disinfecting water is chlorine.