Oblicz stopnie utlenienia chromu w związkach: CrO, Cr2O3, CrO3, K2Cr2O7
CrO- Cr II stopien ulenienia O -II
Cr2O3- Cr III O -II
CrO3- Cr VI O -II
K2Cr2O7- K I Cr VI O -II
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CrO- Cr II stopien ulenienia O -II
Cr2O3- Cr III O -II
CrO3- Cr VI O -II
K2Cr2O7- K I Cr VI O -II