Подберите коэффициенты методом электронного баланса в уравнениях реакций:
KMnO4 + H2O2 → MnO2 + O2 + H2O + KOH
Zn + NaOH + H2O → Na2[Zn(OH)4] + H2
K2Cr2O7 + H2SO4 + K2SO3 → Cr2(SO4)3 + H2O + K2SO4
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