1. Составьте методом электронного баланса уравнения реакций:

Н2S + KMnO4 + H2SO4 = S + MnSO4 + K2SO4 + H2O

FeSO4 + K2Cr2O7 + H2SO4 = Fe2(SO4)3 + Cr2(SO4)3 + K2SO4 + H2O

MnO2 + KClO3 + KOH = K2MnO4 + KCl + H2O
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