Question

There is a mixture of three solid compounds $A,B$ and $C$. Out of these compounds $A$ and $C$ are soluble in water and compound $C$ is sublimable as well. In what sequence, the following techniques can be used for their effective separation?
I. Filtration
II. Sublimation
III. Crystallisation from water extract
IV. Dissolution in water

• A. (II), (I), (IV), (III)
• B. (IV), (I), (II), (III)
• C. (I), (II), (III), (IV)
• D. (II), (IV), (I), (III)

Answer 1

The correct option is D (II), (IV), (I), (III)

$A+B+C$ is a mixture. $C$ is soluble and sublimable. So, there's no use of using dissolution first.
$C$ can be separated using sublimation technique. $A$ and $B$ can be separated by dissolution in water followed by filtration. $A$ is soluble and $B$ is insoluble. After filtration $B$ can be obtained and $A$ can be obtained by crystallisation.