Solutions Test ...

A liquid mixture of A and B (assume ideal solution ) is placed in a cylinder and piston arrangement . The piston is slowly pulled out isothermally so that the volume of liquid decreases and that of vapour increases. at the instant when the quantity of the liquid still remaining is negligibly small, the mole fraction of 'A' in the vapour is 0.4 .If $$ P^0_A = 0.4 atm , P^0_B = 1.2 atm $$ at this temperature, the total pressure at which the liquid has almost evaporated is ?

Liquids A and B from an ideal solution. A certain solution of A and B contains 25 mole percent of A whereas the vapours in the equilibrium with the solution at 298 K contains 50 mole per cent of A. The ratio of vapour pressures of pure A to that of pure B at 298 K , is 

For each of the following dilute solutions van't Hoffs factor is equal of 3 except

Liquids A and B from an ideal solution. the plot of $$ \dfrac {1}{X_A} (y-axis) \,vs \,\dfrac {1}{Y_A }(x\, axis ) $$ is linear whose slope and intercept , respectively, are given as

The limiting value of van't Hoff's factor for $$ Na_2SO_4 $$ is 

At what pressure half of the total moles of liquid solution will vaporize ?

The vapour pressure of pure liquid A at $$ 80^0 C $$ is

If the pressure over the mixture at 300 K is reduced at what pressure does the first vapour form?

If the pressure is reduced further, at what presure does the trace of liquid disppear?

The vapour pressure of the solution this composition is: