Which property is shown by an ideal solution?

Two liquids $A$ and $B$ form an ideal solution. When they are mixed in a molar ratio of $1:1$,the vapor pressure of the solution at $300 \ K$ is $400 \ mm \ Hg$. When they are mixed in a molar ratio of $1:2$,the vapor pressure of the solution at the same temperature is $350 \ mm \ Hg$. The vapor pressures of pure liquids $A$ and $B$ are respectively:

Identify the $FALSE$ statement about ideal solutions from the following.

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

Which of the following mixtures does not show positive deviation from Raoult's law?

All form ideal solutions except: