Solutions $A, B, C$ and $D$ are respectively $0 \cdot 2$ M urea, $0 \cdot 10$ M $\mathrm{NaCl}, 0.05…
Solutions $A, B, C$ and $D$ are respectively $0 \cdot 2$ M urea, $0 \cdot 10$ M $\mathrm{NaCl}, 0.05 \mathrm{M} \mathrm{BaCl}_{2}$ and $0.05 \mathrm{M} \mathrm{AlCl}_{3}$.
All solutions are isotonic with each other except
B
A
D
C
Solution
Osmotic pressure, $\pi=$ iMRT
(A) $\pi_{\text {Urea }}=1 \times 0.2 \mathrm{RT}=0.2 \mathrm{RT}$
(B) $\pi_{\mathrm{NaCl}}=2 \times 0.1 \mathrm{RT}=0.2 \mathrm{RT}$
(C) $\pi_{\mathrm{BaCl}_{2}}=3 \times 0.05 \mathrm{RT}=0.15 \mathrm{RT}$
(D) $\pi_{\text {ACC }_{3}}=4 \times 0.05 \mathrm{RT}=0.2 \mathrm{RT}$
$\therefore$ All solutions are isotonic with each other except $\mathrm{C}$.