Why`KMnO_4` is added to purify drinking water ?

Chlorine is used to purify drinking water. Excess of chlorine is harmful. The excess of chlorine is removed by treating with sulphur dioxide. Present a balanced equation for this redox change taking place in water.

Why do we add alum to purify water ?

Why potash alum is added to purify water?

Ozone is used for purifying water because

Alum helps in purifying water by

Why is river water unfit for drinking?

What are the essentials of drinking water ?

Name the steps taken to purify water in a municipal water - treatment plant .

Blue-baby syndrome is caused by drinking water contaminated with

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