1)Cr2(SO4)3+7H2O+3K2S2O6(O2)=K2Cr2O7+4KHSO4+5H2SO4
2)2K2CrO4+16HCl(конц.,90c)=2CrCl3+3Cl2+4KCl+8H2O
3)K2Cr2O7+2KOH(конц.) =2K2CrO4+H2O
4)K2Cr2O7+6KOH+3SO2(t) =2K2CrO2+3K2SO4+3H2O
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