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2Cr₂O₃+4K₂CO₃+3O₂-->4K₂CrO₄+4CO₂
utlenienie:Cr^(3+)->Cr^(6+)+3e //x4
redukcja:4e+O2->2O^(2-) //x3
suma: :4Cr^(3+)+3O2->4Cr^(6+)+6O^(2-)