Question

Maximum depression in freezing point is caused by:

• A. potassium chloride
• B. sodium sulphate
• C. magnesium sulphate
• D. magneisum carbonate

Answer 1

The correct option is B sodium sulphate

Depression in the freezing point is a colligative property, so it depends upon the number of particles.

Among, potassium chloride$\left(KCl\right)$, sodium sulphate $\left(N{a}_{2}S{O}_4\right)$, magnesium sulphate$\left(MgS{O}_4\right)$ and magnesium carbonate $\left(MgC{O}_3\right),N{a}_{2}S{O}_4$ produces maximum number of particles.

$N{a}_{2}S{O}_4\rightleftharpoons \underset{3particles}{\underset{}{2N{a}^{+}+S{O}_4^{2-}}}$

Thus, it causes maximum depression in freezing point.

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