Alum is a water purifier because it

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(A) Alum $(K_2SO_4 \cdot Al_2(SO_4)_3 \cdot 24H_2O)$ contains $Al^{3+}$ ions. When added to water,it undergoes hydrolysis to form $Al(OH)_3$ precipita

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Coagulates the impurities

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(A) Alum $(K_2SO_4 \cdot Al_2(SO_4)_3 \cdot 24H_2O)$ contains $Al^{3+}$ ions. When added to water,it undergoes hydrolysis to form $Al(OH)_3$ precipitate. This precipitate is gelatinous and carries a positive charge,which neutralizes the negatively charged colloidal impurities present in water. This process is known as coagulation,which causes the impurities to settle down,making the water clear and fit for drinking.

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