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JAMB Chemistry 1992 Question 24

Question 24

Redox Reactions

MnO2 + 2Cl− + 4H+ → Mn2+ + Cl2 + 2H2O. The changes in oxidation numbers when the manganese, chloride and hydrogen ions react according to the above equation are respectively

  1. A.2,2,4
  2. B.−1, −2, 4
  3. C.−2, 1, 0
  4. D.2, 4, 0.
Show the answer and explanation

Answer: C (−2, 1, 0)

Explanation

Mn goes from +4 to +2 (change −2), Cl goes from −1 to 0 (change +1) and H stays at +1 (change 0).