Question

The depressions in freezing point for 1 m urea, 1 m glucose and 1 m NaCl are in the ratio:

• A. 1 : 2 : 3
• B. 3 : 2 : 2
• C. 1 : 1 : 2
• D. None of these

Answer 1

The correct option is C 1 : 1 : 2

We have,

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

$i_{urea}=i_{glucose}=1,i_{NaCl}=2$

So, we have ratio for $\Delta T_f$-

$1\times K_f\times 1:1\times K_f\times 1:2\times K_f\times 1=1:1:2$

Hence, option (C) is correct.