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JAMB Chemistry 1978 Question 37

Question 37

Redox Reactions

Consider the following equation: H2O + 2Fe2+ + Cl2 ⇌ 2Fe3+ + 2Cl− + H2O. The only ion which behaves as an oxidising agent is

  1. A.Fe2+
  2. B.Cl2
  3. C.Fe3+
  4. D.Cl−
  5. E.H2O
Show the answer and explanation

Answer: B (Cl2)

Explanation

Chlorine gains electrons (0 → −1) and oxidises Fe2+ to Fe3+, so Cl2 is the oxidising agent (although it is a molecule, not an ion).