For an ideal solution of two components $A$ and $B$,which of the following is true?

What is a non-ideal solution and what is meant by positive deviation from Raoult's law?

Which of the following will form an ideal solution?

At $300 \ K$,the vapour pressure of a pure liquid $A$ is $70 \ mm \ Hg$. It forms an ideal solution with another liquid $B$. The mole fraction of $B$ in the solution is $0.2$ and the total vapour pressure of the solution is $84 \ mm \ Hg$ at the same temperature. What is the vapour pressure (in $mm \ Hg$) of pure liquid $B$ at $300 \ K$?

When does a mixture containing components $A$ and $B$ show negative deviation from Raoult's law?

Identify the mixture that shows positive deviations from Raoult's Law.