Question

Gases are separated from each other by :

• A. Fractional evaporation
• B. Fractional distillation
• C. Fractional crystallization
• D. Fractional sublimation

Answer 1

The correct option is B

Fractional distillation

Correct Answer: Option(B) Fractional distillation.

Explanation for the correct answer:

1. Fractional distillation: The process of separation of two or more miscible liquids with differences in their boiling points close to each other into individual components by distillation is called fractional distillation.
2. This process begins by cooling the mixture until a liquid is formed.
3. Once the liquid has been formed, it is heated.
4. Gases with a lower boiling point rise in the distillation column, and are thus separated.

Explanation for the incorrect answer:

1. Option (A) Fractional evaporation: The process of obtaining a non-volatile soluble solid from its solution by allowing the liquid component to vaporise is called evaporation.
2. Option (C) Fractional crystallization: The process of separating two or more crystalline solids based on the difference in their solubilities in the same solvent is called fractional crystallization.
3. Option (D) Fractional sublimation: A method for purifying samples by heating the sample under reduced pressure and allowing the fractions to sublime order of increasing sublimation temperature

Gases are separated from each other by: Option(B) Fractional distillation.