1. Solution and colligative properties — Chemistry STD 12 Science — Question

$\pi \rightarrow$ osmotic pressure

$C \rightarrow$ molarity

$NaCl$ is a strong electrolyte

$\pi_{ a }=2 RT$ ( $\because NaCl$ gives two ions on dissociation)

$\pi_{ b }= RT$ for glucose

$\pi_{ c }=2 RT$ for urea

$\therefore$ Glucose solution has minimum osmotic pressure