Step-by-step explanation:
When a solute is added to the solvent, some of the solute molecules occupy the space near the surface of the liquid. When a solute is dissolved in a solvent, the number of solvent molecules near the surface decreases, and the vapor pressure of the solvent decreases.
This has no effect on the rate at which solvent molecules in the gas phase condense from a liquid. But it decreases the rate at which the solvent molecules in the liquid can escape into the gas phase.
As a result, the vapor pressure of the solvent escaping from a solution should be smaller than the vapor pressure of the pure solvent.
Answer: The vapor pressure is increased. (does not occur)