Question

Which of the following statements regarding Ideal solutions is false?

(a) Ideal solutions obey Raoult’s law under all conditions of temperature and concentrations

(b) There will be some change in volume on mixing the components, i.e., ΔVmixing ≠ 0

(c) There will be no change in enthalpy when the two components are mixed, i.e., ΔHmixing = 0

(d) There will be no change in volume on mixing the components, i.e., ΔVmixing = 0

This question was addressed to me in quiz.

Query is from Ideal and Non-Ideal Solutions topic in section Solutions of Chemistry – Class 12

Answer 1

Right answer is (b) There will be some change in volume on mixing the components, i.e., ΔVmixing ≠ 0

To explain: An ideal solution is the solution in which each component obeys Raoult’s law under all conditions of temperature and concentrations. An ideal solution will satisfy the following conditions:

I. There will be no change in volume on mixing the components, i.e., ΔVmixing = 0.

II. There will be no change in enthalpy (i.e., no heat is evolved or absorbed) when the two components are mixed, i.e., ΔHmixing = 0.