First slide

Uses of Boron & Aluminium

Question

Which statement is not true about potash alum ?

Moderate

A

Its empirical formula is $KAl {({SO}_{4})}_{2} . 12 H_{2} O$
B

It is used in dyeing industries
C

Its aqueous solution is basic in nature
D

On heating it melts and loses its water of crystallization

Solution

Alum forms acidic solution on dissolution in water due to hydrolysis of ${Al}^{3 +}$ ions.

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