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

Which of the following does not show positive deviation from Raoult's law?

Which condition is not satisfied by an ideal solution?

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

$A$ mixture of toluene and benzene boils at $100^{\circ} C$. Assuming ideal behaviour,the mole fraction of toluene in the mixture is closest to (Vapour pressures of pure toluene and pure benzene at $100^{\circ} C$ are $0.742 \ bar$ and $1.800 \ bar$,respectively. $1 \ atm = 1.013 \ bar$)

When $25 \ mL$ of acetone is mixed with $25 \ mL$ of ethanol,the volume of the resulting solution will be ...........