Statement 1: Two closed vessels of 1 L and 2 L capacity, each containing some liquid ether at the same temperature, show the same vapour pressure of ether.
Statement 2: At a given temperature, the most probable speed of ether vapour molecules is the same in both vessels.

Question

Statement 1: Two closed vessels of 1 L and 2 L capacity, each containing some liquid ether at the same temperature, show the same vapour pressure of ether.

Statement 2: At a given temperature, the most probable speed of ether vapour molecules is the same in both vessels.

TestHub · Accepted Answer

Statement I is correct: vapour pressure of a pure liquid depends only on temperature, not on the vessel size or free space. Statement II is also correct: vₘₚ = √(2RT/M) is set by T alone, so it is equal in both vessels. But equal molecular speeds do not cause equal vapour pressures (vapour pressure is a liquid–vapour equilibrium property), so II is not the explanation of I. Ans: (b).

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