Camphor in nitrogen gas is a type of solution

The correct answer is Option (2) → Solid – Gas

A solution is named by the physical state of its solute and of its solvent. The solvent is the component present in larger amount and decides the state of the solution.

In camphor in nitrogen gas, nitrogen (a gas) is the solvent and camphor (a solid that sublimes) is the solute. It is a gaseous solution of the type solid in gas.

The three gaseous solutions are:

• gas in gas: mixture of oxygen and nitrogen gases;

• liquid in gas: chloroform mixed with nitrogen gas;

• solid in gas: camphor in nitrogen gas.

Why the other options are incorrect

• Option (1) Gas – Gas — Incorrect. Both components are gases, as in a mixture of oxygen and nitrogen; camphor is a solid.

• Option (3) Liquid – Gas — Incorrect. The solute is a liquid, as in chloroform mixed with nitrogen gas.

• Option (4) Solid – Liquid — Incorrect. A solid dissolved in a liquid, as in glucose dissolved in water; this is a liquid solution, but here the solvent is nitrogen gas.

NCERT (2026-27 edition):
Types of Solutions – …

Note: The same/similar question has been asked in different years by NTA as per the details given below: