Question

Impure salts can be purified by the process :

• A. Fractional evaporation
• B. Distillation
• C. Fractional purification
• D. Crystallization

Answer 1

The correct option is D

Crystallization

The explanation for the correct options:

Option (D) Crystallization:

1. Crystallization is the cooling of a heated, concentrated solution of a chemical to obtain crystals.
2. Common salt, derived from seawater, is a tainted material with numerous contaminants. Crystallization can thus purify this common salt.
3. Seawater is heated and then cooled off to get crystals of common salt.

The explanation for the incorrect options:

Option (A) Fractional Evaporation:

• Fractional evaporation is the process of distilling two or more miscible liquids with different boiling points that are near to each other into distinct components.

Option (B) Distillation:

• Distillation is the process of heating a liquid to produce vapor and then cooling the vapor to recover the liquid.

Option (C) Fractional Purification:

• Fractional distillation is a method of separating components in a chemical mixture into discrete parts (called fractions) based on their boiling points.

Hence, Option (D) Crystallization is the correct answer.