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Presence of carbonaceous matter in the sewage | |
A. | causes reduction in its dissolved oxygen content thereby endangering the life of aquatic creatures. [Wrong Answer] |
B. | reduces sulphate ions to sulphides causing obnoxious smell. [Wrong Answer] |
C. | increases the quantity of chlorine used for its purification. [Wrong Answer] |
D. | all (a), (b) and (c). [Correct Answer] |