Помогите: уровнять электронным балансом.
1) H2S+HIO3 => S+I2+H2O
2) FeSO4+HNO3+H2SO4 => Fe(SO4)3+NO+H2O
3) KMnO4+KNO2+KOH => K2MnO4+KNO3+H2O
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