The alum used for purifying water is

Ferric alum

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Chrome alum

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Potash alum

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Ammonium alum

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Solution

The correct option is B Potash alum
Potash alum $(K_{2} S O_{4} . A l_{2} (S O_{4})_{3} . 24 H_{2} O)$ is generally used for purifying water.

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Alum is used to purify water since it acts as

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