ОХ254 Make a material and an electronic balance the fol

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254. Make a material and an electronic balance the following redox reactions:
H2 SO4 + H2S  S0 + H2O;
HC1 + HMnO4  MnC12 + C12 + H2O;
H2SO3 + C12 + H2O  H2SO4 + HC1;
H2SO4 + Cu  CuSO4 + SO2 + H2O.

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