Question

Mixture of sand and camphor is purified by:
A. Separating funnel
B. distillation
C. Cooling
D. Sublimation

Answer 1

Hint: In the given mixture sand and camphor, both the components are present in solid state out of which one component on heating can change its state to form vapour by leaving the middle state liquid.

Complete step by step answer:
Separating funnel is used to separate mixtures of components dissolved in different solvents. The mixture is poured in the separating funnel as two mixtures are immiscible, they form two different layers. The solvent with high density will be present below and the solvent with low density will be present above in the separating funnel. The knob of the separating funnel is then opened and the two layers are collected separately in different beakers.
Distillation is used to separate a mixture of liquid components. The main principle behind the separation is the difference in boiling point. The liquid with high boiling point will evaporate first and then condensed and get collected in the separate beaker.
Cooling is not a separation technique. In the distillation process, the liquid which is evaporated is then cooled by the condenser and collected in the beaker.
Sublimation is a process where the compound changes its state from solid to directly into vapours escaping the liquid state.
The given mixture is of sand and camphor. Both the components are in solid state. On heating sand does not change its state but camphor on heating changes to vapor and sand is left behind.
Thus, mixture of sand and camphor is purified by sublimation.
So, the correct answer is “Option D”.

Note:
The vapours which are formed during the sublimation process are then cooled using condensers and can be collected back as a liquid or solid which is known as sublimate.