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JAMB Chemistry 1983 Question 17

Question 17

Electrolysis

In the above experiment (Fig. 2), a current was passed for 10 minutes and 0.63 g of copper was found to be deposited on the cathode of CuSO4 cells. The weight of silver deposited on the cathode of AgNO3 cell during the same period would be [Cu = 63, Ag = 108]

Diagram for this question
  1. A.0.54 g
  2. B.1.08 g
  3. C.1.62g
  4. D.2.16 g
  5. E.3.24 g.
Show the answer and explanation

Answer: D (2.16 g)

Explanation

0.63 g Cu = 0.01 mol, which needed 0.02 mol of electrons (Cu2+). The same charge deposits 0.02 mol Ag (Ag+) = 0.02 × 108 = 2.16 g.