First slide

Uses of Boron & Aluminium

Question

Which of the following general formulae represent alum ?

Moderate

A

$M_{2} {CO}_{3} . M_{2} {({SO}_{4})}_{3} . 12 H_{2} O$
B

$M_{2} {SO}_{4} . {({SO}_{4})}_{3} . 12 H_{2} O$
C

$M_{2} {SO}_{4} . {({SO}_{4})}_{2} . 12 H_{2} O$
D

$M_{2} {SO}_{4} . M'_{2} {({SO}_{4})}_{3} . 24 H_{2} O$

Solution

Alum is a hydrated sulphate of monovalent and trivalent metal.

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