$1\text{ mole}$ of liquid A and $2\text{ moles}$ of liquid B make a solution having a total vapour pressure of $40\text{ torr}$. The vapour pressure, of pure A and pure B are $45\text{ torr}$ and $50\text{ torr}$, respectively. The above solution

shows positive deviation.

The correct answer is Option (2) → shows positive deviation. ##

Shows positive deviation because $\text{A}-\text{B}$ forces of attraction are weaker than $\text{A}-\text{A}$ and $\text{B}-\text{B}$ components.