1. The problem statement, all variables and given/known data Acetone and carbon disulphide form binary liquid solution showing positive deviation from Raoult's law, The normal boiling point(BP) of pure acetone is less than that of pure carbon disulphide. Select the incorrect statement(s) among the following. A)BP of mixture is always less than the BP of acetone. B)BP of the azeotropic mixture is always less than the BP of pure CS2. C)When a small amount of CS2 is added to an excess of acetone, BP of solution increases. D)A mixture of acetone and CS2 can be completely separated by simple fractional distillation. 3. The attempt at a solution The first option is incorrect as BP always increases. Second option is correct as the mixture is a minimum BP azeotrope. I'm confused about the third option. The answer says it is incorrect but according to what I've read, BP always increases on addition of solute. For option D, I'm not sure how to think about that as I don't know much about fractional distillation and how it can be applied to this problem.