Question

The equivalent mass of metal $M$ is $x$ and the formula of its oxide is $M_n{O}_m$. The atomic mass of metal will be:

• A. $\frac{2n.x}{m}$
• B. $\frac{2m.x}{n}$
• C. $\frac{2mn}{x}$
• D. $\frac{m.n}{x}$

Answer 1

The correct option is B $\frac{2m.x}{n}$

Let valence of $M$ is $v$ then,

$n\times v=2\times m$

$v=\frac{2m}{n}$

Atomic mass = equivalent mass $\times$ valency

$=\frac{x.2m}{n}=\frac{2mx}{n}$