Question

in which situation can a mixture always be called a solution? when one of its components is a gas when there is no solvent in the mixture when its components are made up of different types of particles when the mixture is homogeneous

Explanation:

A solution is a homogeneous mixture where the solute is uniformly distributed in the solvent at a molecular - level. A gas as a component doesn't define a solution, lack of solvent means it's not a solution, and different types of particles don't guarantee a solution. Only a homogeneous mixture can always be called a solution.

Answer:

when the mixture is homogeneous