Question

0.5 g of a metal gave on oxidation 0.7 g of its oxide. The equivalent weight of metal is:

• A. 40 g
• B. 20 g
• C. 14 g
• D. 10 g

Answer 1

Answer: (B)

20 g

Weight of element $=0.5$ $g$

Weight of oxide $=0.7-0.5=0.2$ $g$

$0.2$ $g$ of oxygen combines with $0.5$ $g$ element.

Equivalent weight of $oxygen=8$

$8$ $g$ of oxygen combines with $\left(\frac{0.5}{0.2}\right)\times 8=20$ $g$ (Equivalent weight)

So, equivalent weight of metal is $20$ $g$.

Hence, option $B$ is correct.