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 $=0.002\times {10}^{25}\times 2\times 1.6\times {10}^{-19}$ $\therefore$ $\frac{chargedelivered}{second}$ $=\frac{0.002\times {10}^{25}\times 2\times 1.6\times {10}^{-19}}{100\times 60}$ = 1.06 C per second