Chemical Process
Comparing sulphate process with sulphite process, we find that __________ in the later.

Temperature is more in the former whereas pressure is more
Both temperature & pressure in the former is more than that
Both temperature & pressure in the former is less than that
Pressure is more in the former whereas temperature is less

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Chemical Process
Presence of carbonaceous matter in the sewage

Increases the quantity of chlorine used for its purification
Causes reduction in its dissolved oxygen content thereby endangering the life of aquatic creatures
All of these
Reduces sulphate ions to sulphides causing obnoxious smell

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