Which of the following mixtures forms an ideal solution?

Which of the following will form 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:

For which of the following mixtures is $\Delta_{mix} H > 0$?

Which of the following does not belong to an ideal solution?

Which condition is not satisfied by an ideal solution?