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Given CO 3+ + e – → CO 2+ ; Eº = + 1.81 V Pb 4+ + 2e – → Pb 2+ ; Eº = + 1.67 V Ce 4+ + e – → Ce 3+ ; Eº = + 1.61 V Bi 3+ + 3e – → Bi ; Eº = + 0.20 V Oxidizing power of the species will increase in the order:

1. Co 3+ < Ce 4+ < Bi 3+ < Pb 4+
2. Co 3+ < Pb 4+ < Ce 4+ < Bi 3+
3. Ce 4+ < Pb 4+ < Bi 3+ < Co 3+
4. Bi 3+ < Ce 4+ < Pb 4+ < Co 3+

Correct answer: Bi 3+ < Ce 4+ < Pb 4+ < Co 3+

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