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WAEC - Chemistry (2010 - No. 28)

What is the change in oxidation number of manganes in the reaction represented by the following equation? MnO-4(aq) + 8H+(aq) + 5e- → Mn2+(aq) + 4H2O(l)
+3 to + 2
+ 4 to + 2
+ 5 to + 2
+ 7 to 2

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