Question
Question: Which of the following liquid mixtures exhibits positive deviation from Raoult's law?...
Which of the following liquid mixtures exhibits positive deviation from Raoult's law?
A
Benzene + toluene
B
Ethanol + acetone
C
Phenol + aniline
D
Chloroform + acetone
Answer
Ethanol + acetone
Explanation
Solution
In an ideal solution, the interactions between unlike molecules are nearly the same as those between like molecules. However, in a solution exhibiting positive deviation from Raoult’s law, the intermolecular attractive forces between the different components are weaker than those in the pure substances, leading to higher vapor pressures. Ethanol + acetone has weaker intermolecular attractions compared to their self-interactions, which results in positive deviation from Raoult’s law.