Two elements A and B form compounds having molecular formula and

CHEMISTRY · Subjective · CBSE · Chemistry · Solutions · Solutions

Problem

Two elements A and B form compounds having molecular formula

\text{AB}_2

and

\text{AB}_4

. When dissolved in 20 g

\text{C}_6\text{H}_6

, 1 g of

\text{AB}_2

lowers the f. pt. by

2.3^\circ\text{C}

whereas 1.0 g of

\text{AB}_4

lowers it by

1.3^\circ\text{C}

. The

K_f

for

\text{C}_6\text{H}_6

5.1 \text{ K mol}^{-1} \text{ kg}

. Calculate atomic mass of A and B.