Two 1 -litre flask A and B are connected to each other by a valve which is closed. Flask A has benzene in equilibrium with its vapours at `30^(@)C.` The flask B, is evacuated, and the valve is opened. Which of the following is true. I f temperature is kept constant.'

Options

A. Some of the benzene molecules would move to flask B from flask A.
B. Vapour pressure will be half the initial value.
C. The vapour pressure remains unchanged
D. Some more of the liquid benzene in flask A would evaporate.

Answer

C

Explanation

There is no change in vapour pressure.