Consider the following liquid-vapor equilibrium 
Liquid  ↔  Vapour 
Which of the following relation is correct?

1. \(\frac{dlnp}{dT}=\frac{-\Delta H_v}{RT}\)

2. \(\frac{dlnp}{dT^2}=\frac{-\Delta H_v}{T^2}\)

3. \(\frac{dlnp}{dT}=\frac{\Delta H_v}{RT^2}\)

4. \(\frac{dlnG}{dT^2}=\frac{-\Delta H_v}{RT^2}\)

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°C.

(Given, vapour pressure data at 25°C, benzene = 12.8 kPa, toluene = 3.85 kPa)

1. The vapour will contain a higher percentage of toluene

2. The vapour will contain equal amounts of benzene and toluene

3. Not enough information is given to make a prediction

4. The vapour will contain a higher percentage of benzene

The van't Hoff factor [i] for a dilute aqueous solution of the strong electrolyte barium hydroxide is?

(1) 0

(2) 1

(3) 2

(4) 3

The temperature dependent term among the following is -

If molality of the dilute solution is doubled, the value of molal depression constant (K_f) will be?

(1) doubled

(2) halved

(3) tripled

(4) unchanged