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(1)
Fe + CuSO4 ----> FeSO4 + Cu
Fe + Cu2+ + SO42- ----> Fe2+
+ SO42- + Cu
Now, the SO42- is unchanged left and right sides of the
equation,
so has not been oxidised nor reduced.
Redox Reaction: Fe + Cu2+ ----> Fe2+
+ Cu
Iron Fe was oxidised to Fe2+, Cu2+ was reduced
to Cu back
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