Q.

If water smells bad, then that odour can be removed by adding –

A. alum
B. bleach
C. activated carbon
D. deactivated nitrogen
Answer» C. activated carbon
Explanation: Adding powdered activated carbon to water or using of granular activated carbon (GAC) in the water filter can remove bad taste and foul odour. Powdered activated carbon (PAC) is the preferred method when the taste and odour is moderate and infrequent. Activated carbon works by a phenomenon called "Adsorption", which is where the odour compound is trapped inside the activated carbon and retained, but the material doing the adsorption does not change size.
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