A solution containing a non-volatile solute exhibits a vapor pressure lowering of 20 mm Hg compared to the pure solvent. If the mole fraction of the solute is 0.2, what is the vapor pressure of the pure solvent in mm Hg?

The partial pressure of ethane over a saturated solution containing $6.56 imes {10^{ - 2}} g$ of ethane is 1 bar. If the solution contains $5.0 imes {10^{ - 2}}\;g$ of ethane, the partial pressure of ethane will be :

In a mixture exhibiting positive deviation from Raoult's law, the enthalpy of mixing ($\Delta H_{mix}$) is:

Which of the following is incorrect?

Which characterises the weak intermolecular forces of attraction in a liquid?

Relative lowering of vapour pressure of a dilute solution is 0.2. What is the mole fraction of the non-volatile solute ?

An ideal solution is formed by mixing benzene and toluene in a 1:1 molar ratio at 25°C. Given the vapor pressures of pure benzene and toluene are 12.8 kPa and 3.85 kPa respectively at 25°C, what is the mole fraction of benzene in the vapor phase?

Which of the following is NOT a characteristic of an ideal solution?

At constant temperature on increasing pressure which is correct

A solution of liquids A and B shows no change in volume and no heat exchange upon mixing. This indicates that:

6 g urea is dissolved in 90 g water. The relative lowering of vapour pressure is equal to :