A binary liquid mixture is formed by mixing two volatile liquids, and the process is accompanied by the absorption of heat ( _ mix H > 0 ) at constant temperature and pressure. Which of the following correctly describes the nature of deviation from Raoult's law and the type of azeotrope that can be formed by this mixture at a specific composition?

Step-by-step solution

For a binary liquid mixture, if the mixing process is endothermic ( _ mix H > 0 ), it implies that the new intermolecular interactions (A-B) are weaker than the pure component interactions (A-A and B-B). Weaker interactions lead to a higher escaping tendency of molecules, resulting in a vapor pressure higher than that predicted by Raoult's law. Thus, the solution exhibits a positive deviation. Because the vapor pressure is higher, the boiling point of the mixture is lower than those of the pure components. At a spe