At constant temperature, in a closed vessel, an ideal solution is formed by liquid – A and liquid – B; and mole-fraction of A and B are 0.6 and 0.4 respectively. If vapour pressure of pure liquids are 125.0 and 62.5 mm respectively, then their mole-fraction in vapour state are respectively – (In vessel, no other component is in gaseous form)
(a) 0.6 and 0.4
(b) 0.4 and 0.6
(c) 0.25 and 0.75
(d) 0.75 and 0.25
