Question

The freezing point depression constant $\left(K_f\right)$ of benzene is ${\text{5.12 K kg mol}}^{–1}$. The freezing point depression for the solution of molality $\text{0.01 m}$ containing a non-electrolyte solute in benzene is
(rounded off upto two decimal places)

• A. $0.1\text{K}$
• B. $0.2\text{K}$
• C. $0.05\text{K}$
• D. $0.5\text{K}$

Answer 1

The correct option is C $0.05\text{K}$

• For non-electrolyte, $i=1$

$\Delta T_f=i{K}_f\times m=5.12\times 0.01=0.0512\approx 0.05\text{K}$