a)K2CrO4+H2O+H2S=S+Cr(OH)3+KOH
2)K2CrO7+H2S+H2SO4=S+Cr2(SO4)3+H2O
3)K2Cr2O7+K2S+H2O=S+K3Cr(OH)6+KOH
4)Cr2(SO4)3+H2O2+NAOH=Na2CrO4+Na2SO4+H2O
Поставить коффициэнты методом электронного баланса,показать как это делается.Нужна срочно
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