Question

In a metal oxide, there is 20% oxygen by weight. Its equivalent weight is:

• A. 40
• B. 64
• C. 72
• D. 32

Answer 1

The correct option is D 32

Metal oxide contains $20\%O_2$

$100$ $gm$ Metal oxide $\to 20$ $gm$ $O_2$

$32$ $g$ Metal oxide $\to \frac{32\times 20}{100}=6,.4$ $g$ $O_2$

Weight of metal $=4\times 6.4=25.6$ $g$ of metal

$\therefore$ Equivalent weight of metal oxide $=6.4+25.6=32$