Chemical Process
Ethyl alcohol cannot be produced

From waste sulphite substrate of paper mills
From molasses
None of these
By esterification and hydroloysis of ethylene

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Chemical Process
Presence of carbonaceous matter in the sewage

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

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