Which of the following mixtures is an ideal solution?

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

For a solution made of two liquids $A$ and $B$,if $P_A < P_A^o X_A$ and $P_B < P_B^o X_B$,then this solution..........

Which pair of liquids shows positive deviation from Raoult's law?

At $27^o C$,the vapor pressure of pure liquid $A$ is $70 \ torr$. It forms an ideal solution with $B$. The mole fraction of $B$ is $0.2$ and the vapor pressure of the solution at $27^o C$ is $84 \ torr$. What is the vapor pressure of pure liquid $B$ at $27^o C$ (in $torr$)?

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