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The solubility of most gases in a liquid changes with temperature in which way, and why?
AIncreases, because dissolution is exothermic
BIncreases, because dissolution is endothermic
CRemains constant, being pressure dependent only
DDecreases, because dissolution is exothermic
Answer & Solution
Correct answer: D. Decreases, because dissolution is exothermic
1. Dissolution of a gas is like condensation and evolves heat, so it is exothermic.
2. By Le Chatelier's principle, raising temperature shifts an exothermic equilibrium backward.
3. Hence the solubility of gases in liquids decreases with rise in temperature.
_Source: NCERT Class 12 Chemistry Ch 1 "Solutions", p.8_
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