Alum is added to muddy water to :

Impart different colours to the solution

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Kill all kinds of microorganisms

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To increase the Tyndal effect

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Fasten the sedimentation rate

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Solution

The correct option is D Fasten the sedimentation rate
Aluminium Sulfate, Shortly known as Alum, when added to raw water reacts with the bicarbonate alkalinities present in water and forms a gelatinous precipitate.

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Which of the following is added to muddy water to settle the colloidal particles?

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