Степень окисления хрома увеличивается в ряду:
1) CrO3,K2Cr2O7,K2CrO4
2)KCrO2,K3[Cr(OH)6],K2CrO4
3)CrO,Cr2O3,CrOOH
4)CrO,K3[Cr(OH)6],K2CrO4
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