The total pressure exerted in ideal binary solution is given by `P = P_(A)^(@)X_(A) + P_(B)^(@) X_(B) " where " P_(A)^(@) & P_(B)^(@)` are the respective vapour pressure of pure components and `X_(A) & X_(B)` are their mole fraction in liquid phase. And composition of the vapour phase is determined with the help of Dalton's law of partial pressure. `Y_(A) = (P_(A)^(@) X_(A))/(P)`
If total pressure exerted in an ideal binary solution is given by `P = (5400)/(60 + 30Y_(A))mm " of " Hg`.
The more volatile liquid is

Options

A. liquid A
B. liquid B
C. both are same
D. it depends on the amount of A and B

Answer

B