Which one of the statements given below concerning properties of solutions, describes a colligative effect? 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

Options

A. Boiling point of pure water decreases by the addition of ethanol
B. Vapour pressure of pure water decreases by 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

C

Explanation

The decrease in vapour pressure of benzene by addition of a non volatile solute (naphthalene) is an example of colligative property.