Chemical Process
Oil is a/an

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

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Chemical Process
Presence of carbonaceous matter in the sewage

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

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