When the solvent is a solid and the solute is a gas, what will the state of the solution be?
What happens when pop the top off a bottle or a can of soda?
The soda, or fizzy drink, bubbles, sometimes furiously. The gas was in solution, in equilibrium with the gas above the solution under the stopper. Remove the stopper, and equilibrium must AGAIN be attained. How does this occur? By the bubbling of gas from the solution into the atmosphere.
And thus if you open a can or bottle of fizzy drink, or pop, or beer, or champagne, eventually the drink will go flat.........after all the gas comes out of the solution.