Which of the following solutions shows positive deviation from Raoult's law?
Answer & explanation
Correct answer: option 3
A positive deviation from Raoult's law occurs when the vapor pressure of a solution is higher than what would be expected based on Raoult's law. This typically happens when there are strong intermolecular forces between unlike molecules, leading to an increase in the vapor pressure of the solution.
Out of the given options, the solution that shows a positive deviation from Raoult's law is:
(3) Acetone and Ethanol
When acetone and ethanol are mixed together, they experience stronger attractive forces between the molecules of different components, resulting in a higher vapor pressure than predicted by Raoult's law. As a result, this solution exhibits a positive deviation from Raoult's law.