2 Cu+O2--->2 CuO
Cu2O+H2--->2 Cu+H2O
2 NO2--->2 NO+O2
2 Al+3 S--->Al2S3
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2 Cu+O2--->2 CuO
Cu2O+H2--->2 Cu+H2O
2 NO2--->2 NO+O2
2 Al+3 S--->Al2S3