Statement 1: Evaporation of water at 2 5 ∘ C in an open dish is spontaneous. Statement 2: The enthalpy of vaporisation of water is negative.

Question

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Statement 1 is true: water evaporates on its own at $2 5^{\circ} C$ .

Statement 2 is false: vaporisation absorbs heat, so $Δ_{v a p} H > 0$ .

It is spontaneous because the entropy gain ( $T Δ S$ ) outweighs the positive $Δ H$ . Answer: (C).

Chemistry - Thermodynamics - II Question with Solution | TestHub