3. Alum is used in water treatment as A. a germicide. В. a decolourising agent. C. an antioxidant. D. a coagulating agent.

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3.

Alum is used in water treatment as
A. a germicide.
В. a decolourising agent.
C. an antioxidant.
D. a coagulating agent.

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Answer: Alum is used in water treatment as a germicide

Step-by-step explanation:

A. a germicide

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