Составить уравнения ОВР и расставить коэффициенты: 1.P2S3 + HNO3 --> H3PO4 + SO2 + NO2 + H2O 2.Cu(NO3)2 --> CuO + NO2 + O2 3.NO2 + KOH --> KNO3 + KNO2 + H2O
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