Выберите все уравнения окислительно-восстановительных реакции :
а) H2+ Cl2=2HCl в) 2HCl + Ca= CaCl2+H2

б) Fe(OH)3 + 3HCl= FeCl3 + 3H2O г) MgCO3+ 2HCl = MgCl2 + CO2 + H2O
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