First slide

Hardness of water

Question

The alum used for purifying water is

Moderate

A

Ferric alum
B

Chrome alum
C

Potash alum
D

Ammonium alum

Solution

$K_{2} {SO}_{4} . {Al}_{2} {({SO}_{4})}_{3} . 24 H_{2} O$
Potash alum is generally used for purifying water.

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