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JAMB Chemistry 1989 Question 22

Question 22

Electrolysis

The same current is passed for the same time through solutions of AgNO3 and CuSO4 connected in series. How much silver will be deposited if 1.0 g of copper is produced? [Cu = 63.5, S = 32, O = 16, Ag = 108, N = 14]

  1. A.1.7 g
  2. B.3.4 g
  3. C.6.8 g
  4. D.13.6 g
Show the answer and explanation

Answer: B (3.4 g)

Explanation

1.0 g Cu = 1/63.5 mol, which needs 2/63.5 F. The same charge deposits 2/63.5 mol of Ag: 108 × 2/63.5 = 3.4 g.