JAMB - Chemistry (1994 - No. 25)

MnO4(aq) + 8H + (aq) + 5Fe2+ → Mn2+(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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