The vapour pressure of pure $$\mathrm{CHCl}_3$$ and $$\mathrm{CH}_2 \mathrm{Cl}_2$$ are 200 and $$41.5 \mathrm{~atm}$$ respectively. The weight of $$\mathrm{CHCl}_3$$ and $$\mathrm{CH}_2 \mathrm{Cl}_2$$ are respectively $$11.9 \mathrm{~g}$$ and $$17 \mathrm{~g}$$. The vapour pressure of solution will be

If boiling point of water is $$100^{\circ} \mathrm{C}$$. How much gram of $$\mathrm{NaCl}$$ is added in $$500 \mathrm{~g}$$ of water to increase its boiling point of water by approx $$1^{\circ} \mathrm{C}\left(K_b\right)_{\mathrm{H}_2 \mathrm{O}}=0.52 \mathrm{~K} \times \mathrm{kg} /$$ mole.

Benzoic acid undergoes dimerisation in benzene solution. The van't Hoff factor $$(i)$$ is related to the degree of association '$$x$$' of the acid as