Each pair forms an ideal solution except?

Which of the following is an ideal solution?

Two liquids $X$ and $Y$ form an ideal solution. At $300 \ K,$ vapour pressure of the solution containing $1 \ mol$ of $X$ and $3 \ mol$ of $Y$ is $550 \ mm \ Hg.$ At the same temperature,if $1 \ mol$ of $Y$ is further added to this solution,vapour pressure of the solution increases by $10 \ mm \ Hg.$ Vapour pressure (in $mm \ Hg$) of $X$ and $Y$ in their pure states will be,respectively:

Benzene and toluene form an ideal solution over the entire range of composition. The vapour pressure of pure benzene and toluene at $T \ K$ are $50 \ mmHg$ and $40 \ mmHg$,respectively. What is the mole fraction of toluene in the vapour phase when $117 \ g$ of benzene is mixed with $46 \ g$ of toluene? (Molar mass of benzene and toluene are $78 \ g \ mol^{-1}$ and $92 \ g \ mol^{-1}$,respectively)

What is vapour pressure? And what is an ideal solution?

Which of the following is true when components forming an ideal solution are mixed?