Which of the following is correct for equilibrium state?
A.The number of molecules leaving the liquid equals✓ Correct
B.The number of molecules leaving the liquid is not
C.The number of molecules leaving the liquid is less
D.The number of molecules leaving the liquid is more
Explanation
A system gives rise to a constant vapour pressure because of an equilibrium in which the number of molecules leaving the liquid equals the number returning to liquid from the vapour. We say that the system has reached equilibrium state at this stage.