1)CrO-основный
CrO+2HNO3=Cr(NO3)2+H2O
CrO+SO3=CrSO4
2)Cr2O3-амфотерный
Cr2O3+6HCl=2CrCl3+3H2O
Cr2O3+2KOH(t) =2 KCrO2+H2O
C2O3+6KOH+3H2O=2K3[Cr(OH)6]
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