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JAMB Chemistry 1987 Question 22

Question 22

Electrolysis

Which of the following statements is CORRECT if 1 Faraday of electricity is passed through 1 M CuSO4 solution for 1 minute?

  1. A.The pH of the solution at the cathode decreases
  2. B.The pH of the solution at the anode decreases
  3. C.1 mole of Cu will be liberated at the cathode
  4. D.60 moles of Cu will be liberated at the anode.
Show the answer and explanation

Answer: B (The pH of the solution at the anode decreases)

Explanation

At the anode OH− ions are discharged as oxygen, leaving H+ ions behind, so the solution there becomes more acidic and its pH falls. 1 F deposits only 0.5 mol Cu, at the cathode.