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JAMB Chemistry 1995 Question 24

Question 24

Electrolysis

How many moles of copper would be deposited by passing 3F of electricity through a solution of copper (II) tetraoxosulphate (VI)? [F = 96 500 C mol-1]

  1. A.0.5
  2. B.1.0
  3. C.1.5
  4. D.3.0
Show the answer and explanation

Answer: C (1.5)

Explanation

Cu2+ + 2e− → Cu, so 2 F deposit 1 mol of copper. 3 F deposit 3/2 = 1.5 mol.