Chemical Process
Use of chlorine in the treatment of sewage

Causes bulking of activated sludge
Increases the biological oxygen demand(BOD)
Aids in flocculation
Helps in grease separation

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Chemical Process
Pick out the wrong statement pertaining to nitric acid.

Arc process of nitric acid manufacture is economical as compared to Ostwald
Yellow color of impure nitric acid is because of dissolved oxides of nitrogen (mainly NO₂)
About 90% of nitric acid is manufactured by Ostwald
It is a strong mono basic acid which reacts with almost all the metals except noble metals

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