Question

The anthracene is purified by:
A.Crystallization
B.Filtration
C.Distillation
D.Sublimation.

Answer 1

Hint:Anthracene is a solid polycyclic aromatic hydrocarbon with formula ${{\text{C}}_{\text{14}}}{{\text{H}}_{\text{10}}}$ with three fused benzene rings. Coal tar contains about \[1.5%\] anthracene and is a major source of the material.

Complete answer:
Crystallization is the process by which solid forms where the atoms or the molecules are highly organized into a structure that is known as a crystal. This method of purification is used to obtain used solid substances from impure solid substances.
Filtration is the process of separation in which the substances are dissolved in a solvent in which the solute to be separated is insoluble in the solvent and is hence separated on the filter paper.
Distillation is the process of purification by boiling liquid component mixtures in which the components with higher boiling point will evaporate faster and the liquid with lower boiling point will remain behind.
Finally sublimation is the process of separation in which one of the components of a solid mixture sublimes into the gas phase and then recrystallizes again to form the pure solid.
Among the above methods, anthracene is purified by the method of recrystallization and sublimation.

So the correct answer is option D, sublimation.

Note:
 Anthracene is used to make different dye-stuffs such as red alizarin and other pigments. It is generally colourless but it exhibits a blue fluorescent light under ultraviolet or UV radiation. The mineral form of anthracene is called freitalite and is related to a coal deposit.