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Alum is widely used to purify water since (a) it forms complex with clay particles

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Alum is widely used to purify water since

(a) it forms complex with clay particles

(b) it coagulates the mud particles

(c) it exchanges Ca2+ and Mg2+ ions present in hard water

(d) its sulphate ion is water purifier

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1 Answer

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Best answer

Correct option (b) it coagulates the mud particles

Explanation:

Mud is a colloidal charged solution which on treatment with alum (Al3+) gets neutralised or coagulated.

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