Chemical Process
Presence of carbonaceous matter in the sewage

Reduces sulphate ions to sulphides causing obnoxious smell
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

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Chemical Process
Oil is a/an

Mixture of glycerides
Mixture of glycerides of fatty acids
Solid at normal temperature
Ester of alcohols other than glycerine

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