Answer: Option (B) is the correct answer.
Explanation:
Vapor pressure of a liquid is defined as the pressure exerted by the vapors in equilibrium with the liquid/solution at a particular temperature.
So, when a non-volatile solute is added to a solvent then its molecules align at the surface of liquid. As a result, less number of solvent molecules will escape from the solution. Thus, there will be decrease in vapor pressure.
Hence, it will disrupt the equilibrium between the solid and liquid state. Consequently, there will also be decrease in freezing point of the solution.
Thus, we can conclude that when a salt is dissolved in water, which has a freezing point of 0 degrees Celsius. The freezing point of the solution will be Less than 0 degrees celsius.
