Question

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

• A. The solution formed is an ideal solution.
• B. The solution is non-ideal, showing positive deviation from Raoults Law.
• C. The solution is non-ideal, showing negative deviation from Raoults Law.
• D. n-heptane shows positive deviation while ethanol shows negative deviation from Raoults Law.

Answer 1

The correct option is B The solution is non-ideal, showing positive deviation from Raoults Law.

On mixing n-heptane and ethanol; strong interactions (ethanol H-bonding) are replaced by weak interaction. Hence, it is non-ideal solution with positive deviation.

Hence option B is correct.