The van't Hoff factor (i) for a dilute aqueous solution of the strong electrolyte barium hydroxide is

Which of the following statements about the composition of the vapour over an ideal 1 : 1 molar mixture of benzene and toluene is correct? Assume that the temperature is constant at 25^oC. (Given, vapour pressure data at 25^oC, benzene = 12.8 kPa, toluene = 3.85 kPa)

At 100^oC the vapour pressure of a solution of 6.5 g of a solute in 100 g water is 732 mm. If K_b = 0.52, the boiling point of this solution will be

The boiling point of 0.2 mol kg^$$-$$1 solution of X in water is greater than equimolal solution of Y in water. Which one of the following statements is true in this case?