Which of the following mixtures forms an ideal solution?

Vapour pressures of pure liquids $A$ and $B$ are $300$ and $800 \ torr$ respectively at $25^{\circ}C$. When these two liquids are mixed at this temperature to form a solution in which mole percentage of $B$ is $90$,the total vapour pressure is observed to be $720 \ torr$. Which of the following is true for this solution?

On mixing $10 \ mL$ $CCl_4$ and $10 \ mL$ benzene,the total volume of solution is

The liquid pair benzene-toluene shows

Which from the following liquid mixtures behaves nearly as an ideal solution?

$A$ non-ideal solution was prepared by mixing $30 \ mL$ chloroform and $50 \ mL$ acetone. The volume of the mixture will be