At $27^{\circ} C$,two liquids $A$ and $B$ form an ideal solution with mole fractions $0.67$ and $0.33$ respectively. If the vapour pressure of pure $A$ and $B$ at $27^{\circ} C$ are $300 \ mm$ and $450 \ mm$ respectively,the total vapour pressure of the solution in $mm$ is:

Which of the following mixture$(s)$ show$(s)$ positive deviation from Raoult's law at $35^{\circ}C$?
$(A)$ Carbon tetrachloride + methanol
$(B)$ Carbon disulphide + acetone
$(C)$ Benzene + toluene
$(D)$ Phenol + aniline

Which condition is not satisfied by an ideal solution?

$A$ binary liquid solution is prepared by mixing $n$-heptane and ethanol. Which one of the following statements is correct regarding the behaviour of the solution?

Assuming ideal behaviour,the enthalpy and volume of mixing of two liquids respectively,are

Liquid $A$ and $B$ form an ideal solution. The vapour pressure of pure liquids $A$ and $B$ are $350 \ mm \ Hg$ and $750 \ mm \ Hg$ respectively at the same temperature. If $x_A$ and $x_B$ are the mole fractions of $A$ and $B$ in the solution,and $y_A$ and $y_B$ are the mole fractions of $A$ and $B$ in the vapour phase,then: