Consider two liquids $\mathrm{A} \& \mathrm{B}$ having pure vapour pressures ${\mathrm{P}}_{\mathrm{A}}°\&{\mathrm{P}}_{\mathrm{B}}°$ forming an ideal solution. The plot of $\frac{1}{{\mathrm{X}}_{\mathrm{A}}}\mathrm{v}/\mathrm{s}\frac{1}{{\mathrm{Y}}_{\mathrm{A}}}$ (where ${\mathrm{X}}_{\mathrm{A}}$ and ${\mathrm{Y}}_{\mathrm{A}}$ are the mole fraction of liquid $\mathrm{A}$ in liquid and vapour phase respectively) is linear with slope and $\mathrm{Y}$ intercepts respectively:

Assuming the formation of an ideal solution, determine the boiling point of a mixture containing $1560 \mathrm{g}$ benzene (molar mass $=78$ ) and chlorobenzene (molar mass $=112.5$ ) using the following against an external pressure of $1000$ Torr.

Dry air is slowly passed through three solutions of different concentrations, ${\mathrm{C}}_1, {\mathrm{C}}_2$ and ${\mathrm{C}}_3$; each containing (non volatile) $\mathrm{NaCl}$ as solute and water as solvent, as shown in the Fig. If the vessel $2$ gains weight and the vessel $3$ loses weight, then