First slide

Uses of Boron & Aluminium

Question

Which one of the following mixed sulphates is not an alum ?

Moderate

A

$K_{2} {SO}_{4} . {Al}_{2} {({SO}_{4})}_{3} . 24 H_{2} O$
B

$K_{2} {SO}_{4} . {Cr}_{2} {({SO}_{4})}_{3} . 24 H_{2} O$
C

${Na}_{2} {SO}_{4} . Fe {({SO}_{4})}_{3} . 24 H_{2} O$
D

${CuSO}_{4} . {Al}_{2} {({SO}_{4})}_{3} . 24 H_{2} O$

Solution

${CuSO}_{4} . {Al}_{2} {({SO}_{4})}_{3} . 24 H_{2} O$ It is pseudo alum

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