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

The ideal solutions formed by mixing two liquids $A$ and $B$ at $300 \ K$ in the molar ratio of $1:1$ and $1:2$ have vapour pressures of $400 \ mm$ and $350 \ mm$ respectively. At the same temperature,the vapour pressures of pure liquids $A$ and $B$ in $mm$ respectively are:

In a mixture of $A$ and $B$ components,the solution shows negative deviation when:

For an ideal solution,the correct option is

Which of the following is an ideal solution?

Raoult's law is obeyed by each constituent of a binary liquid solution when