If two liquids A and B form a minimum boiling azeotrope at some specific composition, then which statement…

If two liquids A and B form a minimum boiling azeotrope at some specific composition, then which statement among the following is correct?
  1. A-B molecular interactions are stronger than A-A and B-B interactions.
  2. The total vapour pressure of the mixture is greater than that corresponding to an ideal solution.
  3. There is a slight decrease in volume when the two components are mixed.
  4. ΔHmix will have a negative value.

Solution

Minimum Boiling Azeotropes :-

Non-ideal solutions showing large positive deviation from Raoult's law form minimum boiling azeotropes which boil at temperature lower than boiling point of its components 'A' and 'B', e.g., water and benzene, chloroform and methanol.

The Minimum Boiling Azeotropes has the A-B molecular interactions are weaker than A-A and B-B interactions. They has the total vapour pressure of the mixture is greater than that corresponding to an ideal solution. There is a slight increase in volume when the two components are mixed.  ΔHmix will have positive value.

Hence, the correct statement is that the total vapour pressure of the mixture is greater than that corresponding to an ideal solution.

Asked in: AP EAMCET 2021 (20 Aug Shift 2)

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