Q.

Potassium Permanganate is used for purifying drinking water, because                 .

A. It is a reducing agent
B. It is an oxidising agent
C. It is a sterilising agent
D. It dissolves the impurities of water
Answer» B. It is an oxidising agent
Explanation: Potassium permanganate is a point-of-entry water treatment method that oxidizes dissolved iron, mancianese, and hydrogen sulfide into solid particles that are filtered out of the water. It can also be used tocontrol iron bacteria growth in wells. It is an oxidant, but a poor disinfectant.
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