Question

Which of the following is false regarding Non-Ideal solutions?

(a) They do not obey Raoult’s law

(b) ΔVmixing ≠ 0

(c) ΔHmixing = 0

(d) They form azeotropes

I had been asked this question in an online interview.

This is a very interesting question from Ideal and Non-Ideal Solutions in portion Solutions of Chemistry – Class 12

Answer 1

Correct choice is (c) ΔHmixing = 0

Best explanation: Non-Ideal solutions do not obey Raoult’s law. For Non-Ideal solutions, ΔVmixing ≠ 0, ΔHmixing ≠ 0. Non-ideal solutions form azeotropes or constant boiling mixtures, i.e., they have the same concentration in the vapour phase and the liquid phase.