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JAMB Chemistry 1979 Question 27

Question 27

Redox Reactions

In the redox reaction 2Fe2+ + Cl2 → 2Fe3+ + 2Cl−

  1. A.Cl2 is reduced because it has lost electrons
  2. B.Cl2 is reduced because its oxidation number has decreased
  3. C.Cl2 is reduced because its molecule is changed to two ions
  4. D.Fe2+ is reduced because it has lost electrons
  5. E.Fe2+ is reduced because it has gained electrons.
Show the answer and explanation

Answer: B (Cl2 is reduced because its oxidation number has decreased)

Explanation

Chlorine's oxidation number falls from 0 to −1 as it gains electrons, which is reduction. Fe2+ loses electrons and is oxidised.