Which one of the following given below concerning properties of solutions, describe a colligative effect ?

Options

A. Boiling point of pure water decreases by the addition of ethanol
B. Vapour pressure of pure water decreases by the addition of nitric acid
C. Vapour pressure of pure benzene decreases by the addition of naphthalene
D. Boiling point of pure benzene increases by the addition of toluene

Answer

B