If liquids A and B from an ideal solution, than :

If liquids A and B form an ideal solution.

If liquid A and B form an ideal solution

If liquids A and B form an ideal solution.

If liquids A and B form an ideal solution.

If liquid A and B form ideal solutions

Two liquids A and B form an ideal solution. The ratio of vapour pressures of pure liquids A and B are 3: 5. If the mole fraction of A in the liquid solution at equilibrium with vapours is 0.4, then the mole-fraction of B in the liquid is