Question

Naphthalene can be easily purified by:
A.Sublimation
B.Crystallization
C.Distillation
D.Extraction with a solvent

Answer 1

Hint: Crude oil or coal tar was used to make naphthalene. Naphthalene is also emitted as items burn, so it can be present in tobacco smoke, vehicle exhaust, and forest fire smoke. It’s an insecticide and a pest deterrent. In the United States, naphthalene was first licensed as a pesticide in \[1948\].

Complete answer:
Option A: Sublimation is the method of converting a solid state to a gaseous state without passing into a liquid state. The chemical composition of the balls does not change through sublimation, because it is a physical change.
So, option A is correct.
Option B: The mechanism by which a solid emerges, in which the atoms or molecules are closely arranged into a structure known as a crystal, is known as crystallization.
So, option B is incorrect.
Option C: Distillation, also known as traditional distillation, is the act of separating components or compounds from a liquid mixture by selective boiling and condensation.
So, option C is incorrect.
Option D: The difference in solubility or distribution coefficient between these two immiscible (or partially soluble) solvents causes a compound to move from one to the other during solvent extraction.
So, option D is incorrect.

Option A is the correct answer.

Note:
 After being exposed to naphthalene vapors, people have reported headaches, nausea, dizziness, and/or vomiting. Someone who inhales enough vapor or consumes a naphthalene-containing mothball can develop hemolytic anemia. When red blood cells break down, they stop carrying oxygen as well as they can. Since swallowing naphthalene mothballs, small children have experienced diarrhea, fever, stomach pain, and painful urination of discolored urine. Infants who wore clothes, diapers, or blankets that had been kept in mothballs without being cleaned afterwards developed anemia. Anemia is much more likely in people who have an inherited enzyme deficiency than in people who have natural enzyme levels.