Question

When two volatile liquids A(Solvent) and B(Solute) are mixed assuming B is more volatile, then correct option about plot of vapour pressure versus mole fraction of B is


Negative slope


Final vapour pressure is higher than A


Vapour pressure of A increases


Vapour pressure of solution decreases

Answer 1

Vapour pressure of A increases.

Option (C) is correct.

Explanation:

• In thermodynamic equilibrium, the pressure exerted by the vapors of a liquid in a closed container at the given temperature is called vapor pressure.
• If the liquid is more volatile and has less boiling point then its molecule will lift up more easily and will exert more pressure on the walls of the closed system as compared to the other (less volatile ) liquid present in the mixture.