Which of the following is not an ideal solution?

Explain non-ideal solutions and the occurrence of positive and negative deviations in non-ideal solutions.

Which one of the following is a non-ideal solution?

$A$ liquid solution is formed by mixing $10 \, moles$ of aniline and $20 \, moles$ of phenol at a temperature where the vapour pressure of pure liquid aniline and phenol are $90 \, mmHg$ and $87 \, mmHg$ respectively. The possible vapour pressure of the solution at that temperature is ............. $mmHg$.

For a binary ideal liquid solution,the total pressure of the solution is given as:

What is meant by positive and negative deviations from Raoult's law and how is the sign of $\Delta_{mix} H$ related to positive and negative deviations from Raoult's law?