Question

Two electrolytic cells containing CuSO₄ and AgNO₃ respectively are connected in series and a current is passed through them until 1 mg of copper is deposited in the first cell. The amount of silver deposited in the second cell during this time is approximately (Atomic weights of copper and Silver are respectively 63.57 and 107.88)

• A. 1.7 mg
• B. 3.4 mg
• C. 5.1 mg
• D. 6.8 mg

Answer 1

Answer: (B)

3.4 mg

Answer 2

By using $\frac{m_{1}}{m_{2}} = \frac{E_{1}}{E_{2}} \Rightarrow \frac{1}{m_{2}} = \frac{63.57/2}{107.88/1} = \frac{31.7}{107.88} \Rightarrow m_{2} = 3.4mg$