Question

2Cu + H2O + CO2 + O2

. . . . . .. + CuCO3​

Answer 1

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2 Cu + H2O + CO2 + O2 → CuCO3*Cu(OH)2

This is an oxidation-reduction (redox) reaction:

2 Cu0 - 4 e- → 2 CuII (oxidation)

2 O0 + 4 e- → 2 O-II (reduction)

Cu is a reducing agent, O2 is an oxidizing agent.