Which of the following is not true about potash alum?

Which of the following is not true about potash alum?

A
Its ernpirical formula is $KAl {({SO}_{4})}_{2} .12 H_{2} O$ .
B
Its aqueous solution is basic.
C
It is used in dyeing industries.
D
All are correct.

Solution:

$KAl {({SO}_{4})}_{2} \cdot 12 H_{2} O$ is a molecular formula of potash alum.

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