Question

$4g$ of copper was dissolved in concentrated nitric acid. The copper nitrate solution on strong heating gave $5g$ of its oxide. The equivalent weight of copper is :

• A. $23$
• B. $32$
• C. $12$
• D. $20$

Answer 1

Answer: (B)

$32$

5 g of oxide contains 4 g of Cu and 1 g of oxygen.

Thus 1 g of oxygen combines with 4 g of Cu.

8 g of oxygen will combine with $8\times 4=32$ g of Cu

Hence, the equivalent weight of copper is 32 g/eq.

Hence the correct option is B.