AIIMS 2018 Chemistry Gas Solubility Assertion Reason Question
Assertion: Solubility of gases increases with increase in pressure. Reason: Dissolution of gas in liquid is exothermic.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Correct Answer
Detailed Explanation
The assertion is true because according to Henry's Law, the solubility of gases in liquids, such as CO₂ in H₂O, increases with an increase in pressure. However, the reason is false; while the dissolution of some gases can be exothermic, it is not a general rule for all gases, and many gas dissolutions are endothermic. Therefore, while both statements are true, the reason does not correctly explain the assertion, making option B the correct choice. Options A and C are incorrect because they either imply a correct explanation or incorrectly state the truth of the reason, while option D is incorrect as both statements are indeed true.
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