Question

How will the freezing point lowers , boiling point increases and the vapour pressure lowers by the addition of soultes to solvents.

Answer 1

Boiling point is the temperature when the vapor pressure of the solvent becomes equal to the external atmospheric pressure. When a non volatile solute is added in the solvent, solvent molecules take more time and temperature for vapor pressure to reach at atmospheric pressure level and causes the boiling point of the solvent to increase.
Adding a solute to a solution decreases the freezing point, as it will interfere with the frozen solution's crystal structure. Therefore, the temperature will have to be colder to overcome it and freeze the solution now.