Concept:A solution is a homogeneous mixture of a solute and a solvent.
To classify the solution, we identify the physical states of the solute and the solvent.
Explanation:Iodine is a solid at room temperature.
Air is a gaseous mixture, mainly of nitrogen and oxygen.
When iodine is dispersed in air, tiny solid particles of iodine spread uniformly throughout the gaseous medium.
Here, the solute is iodine (solid) and the solvent is air (gas).
Therefore, this mixture is classified as a solid-in-gas solution.
Other examples of this type include camphor in air and smoke in air.
Hence, the given system is not a liquid solution or a solid-liquid mixture.
Answer:Option B: Solid in gas.