Give an example of a solid solution in which the solute is a gas.

Hint: Solid solutions are those having solid as solvent and gas as the solute. One of the examples of this kind of solution finds its application as an alloy as well as in the hydrogen economy as well.

Complete step by step solution:
Solutions are homogeneous mixtures (composition and properties are uniform throughout the mixture) of two or more than two components.
Generally, the component present in large quantities is known as solvent.
Solvent determines the physical state in which the solution exists.
One or more components present in the solution other than the solvent are called solutes.
In general based on the physical state of the solvent, there are three types of solutions: Gaseous , Liquids and Solid solutions.
Solution of Palladium in Hydrogen is an example of a solid solution in which the solute is a gas.
In this example, the solid solvent is Palladium and the gaseous solute is Hydrogen.
The example shown here is a binary solution (ie, consisting of two components).
Hydrogen in Palladium is the answer to this question.

Additional Information:
We will now look at some facts about the solution of hydrogen in palladium given below:
Hydrogen absorption by palladium is reversible and therefore has been investigated for hydrogen storage.
Palladium electrodes have been used in some cold fusion experiments, under the hypothesis that the hydrogen could be "squeezed" (a process called ‘occlusion’) between the palladium atoms to help them fuse at lower temperatures than would otherwise be required.

Note: Do keep in mind the fact that there are three kinds of solid solutions and all the three are different on the basis of solute present in it.