Допишите  уравнения реакций, расставьте коэффициенты:

1) H2 + ?  =  H2S        2) CuO + H2SO4  =  ?  +   Н2О ; 3)      KMnO4 = K2MnO4 + MnO2 + ? ;  

4) Mg  +  H Cl    =          ? + ?.
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