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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.

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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.
answered Feb 28, 2014 by mosymeow_1

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