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 +ve deviation from Raoult's law.
C. The solution is non-ideal, showing -ve deviation from Raoult's law.
D. n-heptane shows +ve deviation while ethanol shows -ve deviation from Raoult's law.

Answer

B

Explanation

The solution containing n-heptane and ethanol shows non-ideal behaviour with positive deviation from Raoult.s law. This is because the ethanol molecules are held together by strong H-bonds, however the forces between n-heptane and ethanol are not very strong, as a result they easily vapourise showing higher vapour presure than expected.