Question

Which of the following aqueous solution will have the highest depression in freezing point?

• A. 0.1 M $urea$
• B. 0.1 M $Sucrose$
• C. 0.1 M ${AlCl}_3$
• D. 0.1 M $K_4\left[Fe{\left(CN\right)}_6\right]$

Answer 1

The correct option is D 0.1 M $K_4\left[Fe{\left(CN\right)}_6\right]$

The depression in freezing point is given by:

$\Delta T_f=i{K}_{f}m$

for that, $i$ should be maximum

for $K_4\left[Fe\right(CN{)}_6]$ $i$ is $5$

so it will have the highest depression in freezing point

Hence, the correct option is $\text{D}$