Question

Why do gases always tend to be less soluble in liquids as the temperature is raised?

Answer 1

Solubility of gases in liquids decreases with an increase in temperature. This is because dissolution of gases in liquids is an exothermic process.
$GAS + Liquid → Solutiion + Heat$
Therefore, when the temperature is increased, heat is supplied and the equilibrium shifts backwards, thereby decreasing the solubility of gases.