Q. 4 g of copper was dissolved in concentrated nitric acid. The copper nitrate solution on strong heating gave 5 g of its oxide. The equivalent weight of copper is
A) 23
B) 32
C) 12
D) 20
Explanation
(b)
Weight of copper oxide=5 g
Weight of copper taken=4 g
$\therefore$ Weight of oxygen in copper oxide=5-4=1 g
$\therefore$ Weight of copper, reacted with 1 g
$O_{2} = 4\ g$
$\therefore$ Weight of copper, which would react with 8 g
$O_{2} = \frac{4 \times 8}{1} = 32\ g$
Hence, equivalent weight of copper=32
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.