Question

Chlorine is used in municipal water treatment plant to:

• A. change the taste of water
• B. prevent evaporation
• C. kill the harmful micro-organisms
• D. prevent sedimentation

Answer 1

The correct option is C

kill the harmful micro-organisms

Explanation for the correct answer: (C) kill the harmful micro-organisms:

• Chlorination is the process by which water is put in a chlorination tank and chlorine is added to it.
• Chlorine kills germs, harmful bacteria and destroys many other harmful substances present in water.

Explanation for the incorrect answers:

(A) change the taste of water: Adding chlorine does not change the taste of water, but a smell of chlorine often remains.

(B) prevent evaporation:

• Evaporation is the process by which water is converted to vapour state at any temperature.
• Adding chlorine does not prevent evaporation.

(D) prevent sedimentation:

• In the purification of water, sedimentation is the process by which water is put in a sedimentation tank so that the solid wastes like faeces settle at the bottom.
• Adding chlorine does not prevent sedimentation.

Therefore, the correct answer is (C) kill the harmful micro-organisms.