Question

What does an ideal solution mean at molecular level?

Answer 1

An ideal solution is formed when two or more completely miscible liquids mix in such a way that the resulting solution obeys Raoult’s law at all concentrations and temperatures.
At the molecular level, the forces between unlike molecules (A-B) are equal to those between like molecules (A-A and B-B), resulting in no enthalpy change (ΔH = 0) and no volume change (ΔV = 0) upon mixing.