Question

Which of the following statement is correct for a solution containing binary mixture of volatile liquids ?

• A. In equilibrium, the vapour consist of only one component which has more vapour pressure.
• B. Partial pressure of each component of an ideal mixture of liquids is dependent of mole fraction of the component in​ the solution.
• C. (a) and (c) above.
• D. Partial pressure of each component of an ideal mixture of liquids is independent of mole fraction of the component in​ the solution.

Answer 1

The correct option is B Partial pressure of each component of an ideal mixture of liquids is dependent of mole fraction of the component in​ the solution.

For a solution containing volatile solute:
In equilibrium the vapour consist of both the components of the solution. The component having more vapour pressure will have more mole fraction in vapour phase.
Raoult's Law:
Partial vapour pressure of each component depends on the mole fraction of the corresponding component.

Partial pressure of each component of an ideal mixture of liquids is equal to the vapour pressure of the pure component multiplied by its mole fraction in the mixture.
For a component 1:

$p=p_1^{\circ }{\chi }_1$

Here $p$ is the partial pressure of component 1
$p_1^{\circ }$ is the vapour pressure of the component 1
${\chi }_1$ is the mole fraction of component 1 in the mixture