Alums purify muddy water by:

Forming true solution

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Absorption

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Dialysis

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Coagulation

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Solution

The correct option is D Coagulation
Stability of the lyophobic sols is due to presence of charge on colloidal particles. If charge is removed, particles come together and settle down. Spontaneous destabilization of solution is ageing and destabilization of solution by artificial means is called coagulation. Alums purify muddy water by coagulation.

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