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 also. 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), (IIl)
• B. (IV), (I), (II), (lII)
• C. (I), (Il), (III), (IV)
• D. (II), (IV), (I), (III)

Answer 1

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

C is sublimable thus it can be separated from a given mixture by sublimation.

The remaining mixture of A and B can be put in water compound B is insoluble in water can be separated out by filtration.

Compound A can be recovered from filtrate by crystallisation.

Hence, the correct order is II, IV, I, III.