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

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

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Chemical Process
Presence of carbonaceous matter in the sewage

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
All of these

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