Statement 1: Gases dissolve in water with evolution of heat, so their solubility in water decreases as the temperature rises.
Statement 2: Dissolution of a gas in a liquid decreases the randomness of the system, so ΔS for the process is positive.

Question

Statement 1: Gases dissolve in water with evolution of heat, so their solubility in water decreases as the temperature rises.

Statement 2: Dissolution of a gas in a liquid decreases the randomness of the system, so ΔS for the process is positive.

TestHub · Accepted Answer

Gas dissolution resembles condensation and is exothermic; by Le Chatelier's principle, raising the temperature then shifts the equilibrium gas + solvent ⇌ solution backward, lowering solubility (Statement 1 correct). Statement 2 correctly notes that randomness decreases but then draws the wrong sign: a decrease in randomness means ΔS < 0, not positive, so Statement 2 is incorrect. Ans: (c).

Chemistry - Thermochemistry Question with Solution | TestHub

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