2Fe+3cl2=2Fecl3cl2+2NaBr=2Nacl+Br2Fe2o3+3co=2Fe+3CO2Fe2O3+2Al=2Fe+Al2O3Cu+4HNO3=Cu(NO3)2+2NO2↑+2H2O根据氧化还原反应,标出化合价有变化的物质的化合价
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