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Q.

The alum used for purifying water is

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a

Ferric alum

b

Chrome alum

c

Potash alum

d

Ammonium alum

answer is C.

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Detailed Solution

K2SO4. Al2(SO4)3. 24H2O

Potash alum is generally used for purifying water.

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The alum used for purifying water is