A) Boiling point of pure water decreases by the addition of ethanol
B) Vapor 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
Correct Answer: C
Solution :
The colligative properties are properties of dilute solutions of non volatile solutes whose value depend on concentration of solute particles in the solution. Naphthalene is a non-volatile solid, hence in addition in benzene decrease its vapour pressure.
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