15. If a nonvolatile solute is dissolved in a volatile solvent, which of the following statementswould be true? (more than one correct answer) i. the vapor pressure of the solution

is always greater than the vapor pressure of the pure solvent. ii. the boiling point of the solution is always greater than the boiling point of the solvent. iii. there will be an decrease in the vapor pressure of the liquid. iv. the liquid will freeze at a higher temperature than the pure solvent. v. there is no effect on the boiling temperature. vi. the freezing point of the solution will always be lower than the freezing point of the pure solvent.