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The least amount of acidified KMnO4 for complete oxidation is:

1. FeSO4
2. FeSO3
3. FeC2O4
4. Fe(NO2)2

Correct answer: FeSO4

Solution

Acidified KMnO4 oxidizes FeSO4 (ferrous sulfate) to Fe3+ ions. Among the given options, FeSO4 requires the least amount of KMnO4 for complete oxidation because it involves a simple one-step oxidation from Fe2+ to Fe3+.

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