Which of the following increases the boiling point of a solvent?

Question

a) Lowering of vapor pressure due to addition of a solute.
b) Decrease in the external pressure.
c) Dilution of the solution.
d) Increase in temperature

I believe the answer is A, just wanted to double check. thanks

Answer 1

yep its A, its called a colligative property: boiling pt elevation

Answer 2

The answer would be (a). Since the vapor pressure is lowered, the temp. must be higher at boiling point.