Question

A metal oxide is reduced by heating it in a stream of hydrogen. It is found that after complete reduction, 3.15 g of the oxide yielded 1.05 g of the metal. Therefore, we can conclude that :

• A. Atomic weight of the metal is 4
• B. Equivalent weight of the metal is 8
• C. Equivalent weight of the metal is 4
• D. Atomic weight of the metal is 8

Answer 1

Answer: (C)

Equivalent weight of the metal is 4

$W_M=\text{Weight of metal}$

$W_O=\text{Weight of oxygen}$

$W_M=\text{Equilivalent weight of metal}$

$W_M=1.05g$ $W_O=3.15-1.05=2.10g$

Now,

$E_M=\frac{W_M\times 8}{W_O}=\frac{1.05\times 8}{2.10}=4$

So the equivalent weight of the metal is 4.