Which of the following aqueous solution will have the lowest freezing point? — Solutions and Colligative Properties Chemistry Question

💡 Solution & Explanation

Lowest freezing point corresponds to the largest depression $\Delta T_f = i \times K_f \times m$. Comparing effective concentrations ($i \times m$): Sucrose ($1 \times 0.1 = 0.1$), $\text{NiCl}_2$ ($3 \times 0.1 = 0.3$), $\text{CuSO}_4$ ($2 \times 0.1 = 0.2$), $\text{NH}_4\text{NO}_3$ ($2 \times 0.1 = 0.2$). $\text{NiCl}_2$ has the highest effective concentration. Therefore, correct answer is B.