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JAMB Physics 1985 Question 47

Question 47

Conduction through Liquids and Gases

Which of the following statements about electrolysis is NOT correct?

  1. A.The substances in solution in the electrolyte become ionized
  2. B.Ions are electrically charged and are attracted towards electrodes when a potential difference is applied
  3. C.Ions may be discharged at the electrodes, forming bubbles or deposits.
  4. D.The mass deposited depends upon the length of time for which current flows
  5. E.The mass of gas set free or metal deposited is proportional to the square of the current.
Show the answer and explanation

Answer: E (The mass of gas set free or metal deposited is proportional to the square of the current.)

Explanation

By Faraday's first law the mass liberated is proportional to the charge (current × time), not to the square of the current.