Превратить схемы реакций на химические уравнения:
Ag+S ->Ag2S ; Na+O2 ->Na2O ; NO+O2 ->NO2 ; KNO3 ->KNO2+O2; Cr2O3+C ->Cr+CO; Fe+CuSO4 ->FeSO4+Cu; FeCl2+Cl2 ->FeCl3  
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