The relationship between osmotic pressure at 273 K when 10 g glucose (P₁), 10 g urea (P₂) and 10 g sucorse (P₃) are dissoved in 250 ml of water is

$$\begin{gathered} \mathrm{Osmotic} \mathrm{pressure}, \mathrm{\pi }=\mathrm{CRT}=\frac{\mathrm{n}}{\mathrm{V}}\mathrm{RT} \\ \mathrm{\pi }\propto \mathrm{n} \left(\mathrm{no}. \mathrm{of} \mathrm{moles}=\frac{\mathrm{mass}}{\mathrm{Molecular} \mathrm{mass}}\right) \end{gathered}$$

In case of given solutions, all the solutions have same mass of solute.

So $\mathrm{\pi }\propto \frac{1}{\mathrm{Molecular} \mathrm{mass}}$

We know that Molecular mass of Urea < Glucose < Sucrose

Hence P₂ > P₁ > P₃