Question

$0.84g$ of metal hydride contains $0.04gm$ of hydrogen. The equivalent wt. of metal is _____.

• A. $80$
• B. $40$
• C. $20$
• D. $60$

Answer 1

The correct option is C $20$

Given: Mass of Metal Hydride $MH$ is 0.84 gm

Mass of hydrogen is 0.04gm.

Solution:

Mass of Metal = Mass of $MH$ - Mass of Hydrogen = 0.84 - 0.04 gm

Mass of Metal = 0.80gm

Now, Equivalent wt. of a substance is defined as the weight of the substance which reacts with 1gm of Hydrogen.

Since 0.04 gm Hydrogen reacts with 0.80 gm of metal to from $MH$.

Therefore, for 1gm of Hydrogen = $\frac{0.80gm}{0.04gm}$ = 20

So, the Correct OPT : C