Maximum osmotic pressure will be shown by which of the following solution (all 90% ionized) — Solutions and Colligative Properties Chemistry Question

💡 Solution & Explanation

Osmotic pressure is proportional to the van't Hoff factor $i$. For 90% ionization: $\text{AlCl}_3 \rightarrow 4$ ions ($i = 1 + 3(0.9) = 3.7$), $\text{BaCl}_2 \rightarrow 3$ ions ($i = 1 + 2(0.9) = 2.8$), NaCl $\rightarrow 2$ ions ($i = 1 + 0.9 = 1.9$). $\text{AlCl}_3$ has the highest effective concentration. Therefore, correct answer is A.