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In dilute aqueous H2SO4, the complex diaquadioxalatoferrate(II), [Fe(C2O4)2(H2O)2]²-, is oxidised by MnO4⁻. For this reaction, what is the ratio of the rate of consumption of H+ to the rate of consumption of MnO4⁻?

1. 4
2. 5
3. 8
4. 10

Correct answer: 8

Solution

Each complex releases 5 electrons (1 from Fe2+ -> Fe3+ and 4 from the two oxalates -> CO2), matching the 5 electrons gained per MnO4⁻; since each MnO4⁻ reduction uses 8 H+, the rate ratio d[H+]/d[MnO4-] = 8.

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