Question

Which of the following is true regarding non-ideal solutions with negative deviation?

(a) The interactions between the components are lesser than in the pure components

(b) ΔVmixing = +ve

(c) ΔHmixing = +ve

(d) They form maximum boiling azeotropes

The question was posed to me in a national level competition.

The doubt is from Ideal and Non-Ideal Solutions in chapter Solutions of Chemistry – Class 12

Answer 1

Correct choice is (d) They form maximum boiling azeotropes

Easiest explanation: The interactions between the components of a non-ideal solution showing negative deviation are greater than the pure components. The change in volume and enthalpy after mixing is negative, i.e., ΔVmixing = -ve, ΔHmixing = -ve.