A binary liquid solution is prepared by mixing n-heptane and ethanol. Which one of the following statements is correct regarding the behaviour of the solution ?

Options

A. The solution formed is an ideal solution.
B. The solution is non-ideal, showing positive deviation from Raoult's law.
C. The solution is non-ideal, showing negative deviation from Raoult's law.
D. n-heptane shows positive deviation while ethanol shows negative deviation from Raoult's law.

Answer

B

Explanation

Ethanol molecules are held by hydrogen bonds but no mixing with n-heptane, the intermolecular forces are not very strong. Hence, they easily evaporate showing higher vapour pressure than expected .