Question

What is the purpose of adding alum to water during the process of purification?

• A. Alum removes the heavy stones and other insoluble substances from water .
• B. Alum removes the suspended clay particles from water.
• C. Alum helps to remove odour from water.
• D. Alum helps in removing bacteria from water.

Answer 1

The correct option is B

Alum removes the suspended clay particles from water.

The heavy particles of dissolved alum deposit on the suspended clay particles in water and settles down at the bottom. Thus, adding alums helps in purifying water.