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JAMB - Chemistry (1994 - No. 25)

MnO_4(aq) + 8H + _(aq) + 5Fe²⁺ → Mn^2+(aq) + 4H₂O_(I). The oxidation number of manganese in the above reaction changed from?

+7 to +2

+6 to +2

+5 to +2

+4 to +2

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