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Oxidation-Reduction Reactions

AP Chemistry· difficulty 3/5

2 KMnO4 + 5 H2C2O4 + 3 H2SO4 -> 2 MnSO4 + K2SO4 + 10 CO2 + 8 H2O Mn: +7 -> +2 ; C: +3 -> +4

Which species is reduced?

  • A

    H2C2O4 (oxalate)

  • B

    CO2

  • C

    H2SO4

  • D

    MnO4- (Mn changes +7 to +2)

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Explanation

Mn's oxidation number drops from +7 in MnO4- to +2 in MnSO4, which is reduction (gain of electrons).

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