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Dissolution of gases in water is

(a) always an endothermic process
(b) always an exothermic process
(c) may be endothermic or exothermic
(d) in this process no heat is evolved or absorbed.

2 Answers

Answer: always an exothermic process
Dissolution of gases in water is a spontaneous process. As such $\Delta G$ for this is -ve. In this case, $\Delta S$ is -ve as dissolution of gases in water is accompanied by a decrease in entropy. For the process to be spontaneous $\Delta H$ has to be -ve, i.e., the process is exothermic.
Solution :
The dissolution of gases in water is virtually always exothermic because The physical reason for this is that when most gases dissolve in solution, the process is exothermic. This means that heat is released as the gas
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