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JAMB Chemistry 2002 Question 15

Question 15

Electrolysis

The products of the electrolysis of dilute sodium hydroxide using platinum electrodes are

  1. A.hydrogen and oxygen gases
  2. B.water and hydrogen gas
  3. C.water and sodium metal
  4. D.sodium metal and oxygen gas.
Show the answer and explanation

Answer: A (hydrogen and oxygen gases)

Explanation

H+ is discharged instead of Na+ at the cathode, giving hydrogen, and OH− is discharged at the anode, giving oxygen (and water).