Question

Which of the following gases are separated by fractional distillation?

• A. Oxygen
• B. Carbon dioxide
• C. Argon
• D. Nitrogen

Answer 1

Answer: (A), (B), (C), (D)

The correct options are
A Oxygen
B Carbon dioxide
C Argon
D Nitrogen

Fractional distillation is a separating technique used to separate the constituents of a liquid-liquid mixture having boiling point difference of less than 25${}^{\text{o}}$C.
Air around us is a homogeneous mixture of many different gases such as carbon dioxide, nitrogen, oxygen, argon, etc. Since they have a difference in their boiling points the air are separated by the process of fractional distillation.