Identify the mixture that shows positive deviation from Raoult’s law

Each pair forms ideal solution except?

Formation of a solution from two components can be considered as

$(i)$ Pure solvent  $\to$ separated solvent molecules $\Delta$ $H_1$

$(ii)$ Pure solute $\to$ separated solute molecules$\Delta$ $H_2$

$(iii)$ Separated solvent and solute molecules $\to$  solution $\Delta H_3$ Solution so formed will be ideal if

Explain the terms ideal and non-ideal solutions in the light of forces of interactions operating between molecules in liquid solutions.

A binary liquid solution is prepared by mixing $n-$ heptaneand ethanol. Which one of the following statements is correct regarding the behaviour of the solution ?