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Difference (from revision 1 to current revision)
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1) O2 is reduced H2 is reducing agent
H2 is oxidized O2 is oxidizing agent
2) Cu+2 is reduced Zn0 is reducing agent
Zn0 is oxidized Cu1(NO3)2 is oxidizing agent
3) All oxidation numbers are same from reactant to product. NOT REDOX RXN