Chemical Process
Temporary hardness of water can be removed by

Addition of alum (a coagulant)
Filtration (through gravity sand filter)
Addition of lime
Boiling

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Chemical Process
Presence of carbonaceous matter in the sewage

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

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Chemical Process
Shaving soaps are

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

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