The correct option for the value of vapour pressure of a solution at 45$$^\circ$$C with benzene to octane in molar ratio 3 : 2 is :

[At 45$$^\circ$$C vapour pressure of benzene is 280 mm Hg and that of octane is 420 mm Hg. Assume Ideal gas]

The freezing point depression constant (K_r) of benzene is 5. 12 K kg mol^-1. The freezing point depression for the solution of molality 0.078 m containing a non-electrolyte solute in benzene is rounded off upto two decimal places :

The mixture which shows positive deviation from Raoult's law is :

For an ideal solution, the correct option is :