Cl2 + H2 = 2HCl;  CuO + 2HCl = CuCl2 + H2O;
 CuCl2 + NaOH = Cu(OH)2 + 2NaCl;
 Cu(OH)2 = CuO + H2O;
 CuO + H2 = Cu + H2O
В уравнениях реакций определить окислитель и востановитель
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