Question

A certain current passing through a copper voltameter deposits 0.002 kg of copper on cathode plate in 100 minutes. If there are $ {{10}^{25}} $ copper atoms in 1kg of copper, the electric charge delivered to cathode by copper ions $ (C{{u}^{2+}}) $ per second will be

• A. 1.06 C
• B. 2.13 C
• C. 0.53 C
• D. 0.71 C

Answer 1

Answer: (A)

: Number of atoms $ =(0.002\times {{10}^{25}}) $ $ \therefore $ Charge $ =0.002\times {{10}^{25}}\times 2\times 1.6\times {{10}^{-19}} $ $ \therefore $ $ \frac{charge\text{ }delivered}{second} $ $ =\frac{0.002\times {{10}^{25}}\times 2\times 1.6\times {{10}^{-19}}}{100\times 60} $ = 1.06 C per second