Why is alum added to water containing suspended impurities?

To make a colloidal solution

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To coagulate the suspended impurities

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To remove impurities of calcium and magnesium

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To protect the colloidal solution from getting precipitated

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Solution

The correct option is B To coagulate the suspended impurities
When alum is added to raw water it reacts with the bicarbonates alkalinities present in water and forms a gelatinous precipitate.
It neutralizes all the suspended impurities of water resulting in their coagulation.

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