Question

Camphor is separated from NaCl by the method:
a.) Sublimation
b.) Distillation
c.) Sedimentation
d.) Evaporation

Answer 1

Hint: Camphor is separated from NaCl by a process in which a solid is heated to obtain vapours. In this process solid is directly converted into gaseous state without converting into solid state.

Complete step by step answer:
Camphor converts directly into its gaseous state without converting into liquid state. This property of camphor helps to separate it from NaCl. The process is called sublimation.
If we talk about this process in detail, when we heat camphor it gets collected into the inner surface of the funnel and the sodium chloride i.e. NaCl get left in the dish in which the mixture is kept. So when a mixture of sodium chloride and camphor is heated, camphor gets sublime and gets directly converted into vapor form. If we cool the vapours they get condensed into the solid state and can easily be collected.
Some other examples of sublimation is dry ice, it also converts from solid state to gaseous state without changing into liquid state. During winter snow and ice can sublimate without melting.
 Distillation is a process in which the separation of substances takes place from a liquid mixture by using the process of selective boiling and condensation. In the sedimentation process gravity is used to remove the suspended solids from water. In evaporation the water changes from liquid state to gas or vapor state.
So, the correct answer is “Option A”.

Note: The mixture of camphor and sodium chloride is generally heated in a china dish which is covered with an inverted funnel closed from the lower end. The proper arrangement of apparatus is very important.