Question

For 1 molal aqueous solution of the following compounds, which one will show the highest freezing point?

• A. \( [\text{Co}(\text{H}_2\text{O})_6]\text{Cl}_3 \)
• B. \( [\text{Co}(\text{H}_2\text{O})_5\text{Cl}]\text{Cl}_2\cdot\text{H}_2\text{O} \)
• C. \( [\text{Co}(\text{H}_2\text{O})_4\text{Cl}_2]\text{Cl}\cdot2\text{H}_2\text{O} \)
• D. \( [\text{Co}(\text{H}_2\text{O})_3\text{Cl}_3]\cdot3\text{H}_2\text{O} \)

Hint:

The freezing point of a solution increases as the number of dissociated particles decreases. Lower dissociation means fewer particles, leading to a higher freezing point.