Question
Question: Why is alum added to water containing suspended impurities?...
Why is alum added to water containing suspended impurities?
A
(a) To make a colloidal solutions
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(b) To coagulate the suspended impurities
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(c) To remove impurities of calcium and magnesium
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(d) To protect the colloidal solutions from getting precipitated
Explanation
Solution
(b)
Sol. 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.