JAMB - Chemistry (2014 - No. 20)

Zn (s) + CuSO 4(aq) → ZnSO 4(aq) + Cu (s)
In the reaction above, the oxidation number of the reducing agent changes from
0 to + 4
0 to + 2
+ 1 to + 2
+ 1 to + 3

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