Alum helps in purifying water by:

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Forming Si complex with clay particles.

Sulphate part which combines with the dirt and removes it.

Aluminium which coagulates the mud particles.

Making the mud water soluble.

answer is C.

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Detailed Solution

Alum helps in purifying water by coagulating the mud particles forming a gelatinous precipitate. Due to coagulation of mud particles, size of particle increase and the become heavy and settle down at the bottom by which water is purified.

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