State an example of gas in solid solution.

Hint: Solid, one of the three basic states of matter, the other being liquid and gas. A solid forms liquid or gas because the energy of atoms decreases when the energy of atoms decreases when the atoms take up a relatively ordered, three-dimensional structure.

Complete step by step solution: A solid solution is a uniform mixture of substance in solid form. Solid solutions often consist of two or more types of atoms or molecules that share a crystal lattice, as in certain metal alloys. The solid solution needs to be distinguished from mechanical mixtures of powdered solids like two salts, sugar and salt, etc.
Examples of solid solutions include crystallized salts from their liquid mixture, metal alloys and moist solids.

Let us understand about deposition.
Deposition is the phase transition in which gas transforms into solid without passing through into solid without passing through the liquid phase. Deposition is a thermodynamic process.

Let us see an example of gas in solid solution.
Water vapor to ice- Water vapor transforms directly into ice without becoming a liquid, a process that often occurs on windows during the winter months. Solution of solid-state solvent and gaseous-state solute are termed gas-solid solutions.

Note: For solids, the positive Gibbs energy “barrier” depends on the melting temperature. If the melting temperature is much higher than the temperature of the solution, the barrier is large, shrinking to zero when the melting temperature and solution temperature becomes identical.