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 ethenol.
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

D

Explanation

Boiling point of a pure solvent increases by increase in number of soluble particles present in it . So by addition of toluence, boiling point of pure benzene increases.