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JAMB Chemistry 1983 Question 23

Question 23

Electrolysis

Which of the following happens during the electrolysis of molten sodium chloride?

  1. A.Sodium ion loses an electron
  2. B.Chlorine atom gains an electron
  3. C.Chlorine ion gains an electron
  4. D.Sodium ion is oxidized
  5. E.Chloride ion is oxidized.
Show the answer and explanation

Answer: E (Chloride ion is oxidized.)

Explanation

At the anode Cl− ions lose electrons to form chlorine gas; losing electrons is oxidation. Na+ gains electrons (is reduced) at the cathode.