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JAMB Chemistry 1982 Question 39

Question 39

Electrolysis

The product formed at the cathode during the electrolysis of sodium chloride solution with carbon electrodes is

  1. A.sodium
  2. B.chlorine
  3. C.hydrogen
  4. D.sodium hydroxide
  5. E.oxygen
Show the answer and explanation

Answer: C (hydrogen)

Explanation

H+ (from water) is discharged in preference to Na+, so hydrogen gas forms at the cathode.