Home Chemistry Surface Chemistry General Why is alum added to water containing suspen…
Chemistry Surface Chemistry General Single Correct MCQ
Published on: August 13, 2026

Why is alum added to water containing suspended impurities?

A
To make a colloidal solutions
B
To coagulate the suspended impurities
C
To remove impurities of calcium and magnesium
D
To protect the colloidal solutions from getting precipitated

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Text Solution

Verified by Experts
The correct answer is:
B

The water obtained from natural sources often contains suspended impurities. Alum is added to such water to coagulate the suspended impurities and make water fit for drinking purposes.

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