Chemical Process
Presence of carbonaceous matter in the sewage

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
Increases the quantity of chlorine used for its purification

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Chemical Process
Shaving soaps are

Soft potassium soaps (potassium salt of fatty acid) with free stearic acid to give lather a lasting property
Metalic soaps compounded with frothing agents
None of these
High free alkali soaps having excess of cane sugar and alcohol

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