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JAMB Chemistry 2003 Question 27

Question 27

Electrolysis

In the electrolysis of a concentrated solution of sodium chloride using inert electrodes, which of the following ions are discharged at the cathode and anode respectively?

  1. A.Na+ and Cl-
  2. B.Na+ and OH-
  3. C.H+ and OH-
  4. D.H+ and Cl-
Show the answer and explanation

Answer: D (H+ and Cl-)

Explanation

H+ is discharged at the cathode in preference to Na+ (hydrogen is given off), and because Cl- is concentrated it is discharged at the anode (chlorine is given off).