Odpowiedź :
2Mg+O2--->2MgO
2Fe+O2--->2FeO
4Fe+3O2--->2Fe2O3
4Al+3O2--->2Al2O3
2Cr+O2--->2CrO
4Cr+3O2--->2Cr2O3
2Cr+3O2--->2CrO3
2Sn+O2--->2SnO
Sn+O2--->SnO2
2H2+O2--->2H2O
4Cu+O2--->2Cu2O
2Cu+O2--->2CuO
4Na+O2--->2Na2O
4Ag+O2--->2Ag2O
2Ag+O2--->2AgO