The osmolarity of 0.2 M- is — Solutions and Colligative Properties Chemistry Question

💡 Solution & Explanation

Sodium sulphate ($\text{Na}_2\text{SO}_4$) is a strong electrolyte that dissociates completely into 3 ions ($2\text{Na}^+$ and $\text{SO}_4^{2-}$). Therefore, its osmolarity is $i \times M = 3 \times 0.2 = 0.6 \text{ M}$. Therefore, correct answer is A.