Выберите уравнения окислительно-восстановительных реакций.
1) CaCO3 = CaO + CO2 ;
2) SO3 + H2O = H2SO4 ;
3) 2NH3 = N2 + 3H2 ;
4) Mg + HCl = MgCl2 + H2
5) 2SO3 = 2SO2 + O2 ;
6) Cu(OH)2 = CuO + H2O ;
7) CO2 + H2O = H2СO3 ;
8) 2FeCl2 + Cl2 = 2FeCl3
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