Chemical Process
Saponification value/number of an oil or fat is a measure of its

Insoluble fatty acid content
Average molecular weight
Fatty acid content
Degree of unsaturation of the fatty acids present in it

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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
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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Chemical Process
Pasteurisation of milk means

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

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