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JAMB Chemistry 1999 Question 27

Question 27

Electrolysis

What quantity of electricity will liberate 0.125 mole of oxygen molecules during the electrolysis of dilute sodium chloride solution? [F = 96 500 C mol−1].

  1. A.24 125 coulombs
  2. B.48 250 coulombs
  3. C.72 375 coulombs
  4. D.96 500 coulombs
Show the answer and explanation

Answer: B (48 250 coulombs)

Explanation

4OH− → O2 + 2H2O + 4e−: one mole of O2 needs 4 F. 0.125 × 4 × 96 500 = 48 250 C.