solutions Questions

Three solutions were prepared by dissolving $10\text{g}$ of glucose ($P_1$), $10\text{g}$ of urea ($P_2$), and $10\text{g}$ of sucrose ($P_3$) in $250\text{ml}$ of water. The right option for the decreasing order of osmotic pressure of these solutions is:

The correct option for the value of vapour pressure of a solution at $45^{\circ }\text{C}$ with benzene to octane in molar ratio $3:2$ is: [At $45^{\circ }\text{C}$ vapour pressure of benzene is $280\text{mm Hg}$ and that of octane is $420\text{mm Hg}$ ]