Chemical Process
Detergent is produced by the sulphonation of dodecyl benzene, which is an __________ reaction.

Irreversible
Both B and C
Endothermic
Exothermic

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

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