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
Increases the quantity of chlorine used for its purification
Reduces sulphate ions to sulphides causing obnoxious smell

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Chemical Process
Pasteurisation of milk means

Removal of fatty and albuminous substance from it
None of these
Killing of organisms present in it by heating it at controlled temperature without changing its natural characteristics
Inhibiting the growth of micro-organisms without killing them

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Chemical Process
Transparent soaps (e.g. Pears) are

Metallic soaps with frothing agent and free stearic acid to achieve transparency
None of these
Usually soft soap (made from coconut oil) in which cane sugar & alcohol are added and finally washed with methylated spirit to achieve transparency
Metallic soaps with frothing agent from which glycerine has not been recovered

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