Question

1 g of non-volatile non-electrolyte solute is dissolved in 100g of two different solvents A and B whose ebullioscopic constants are in the ratio of 1 : 5. The ratio of the elevation in their boiling points, $\frac{\Delta T_b(A)}{\Delta T_b (B)}$, is:

• A. 5:01
• B. 10:01
• C. 1:05
• D. 01:00.2

Answer 1

Answer: (C)

1:05

Answer 2

$\Delta T_{b} = K_{b} \times m$
$\therefore \frac{\Delta T_{b\left(A\right)}}{\Delta T_{b\left(B\right)}} = \frac{K_{b\left(A\right)}}{K_{b\left(B\right)}} as \space m_{A} =m_{B}$
$\therefore \frac{\Delta T_{b\left(A\right)}}{\Delta T_{b\left(B\right)}} = \frac{1}{5}$