Fe(CrO2)2 + 6NaOH + 4H2O → 2Na3[Cr(OH)6] + Fe(OH)2
Iron(II) chromite react with sodium hydroxide and water to produce sodium hexahydroxochromate(III) and iron(II) hydroxide. Sodium hydroxide - concentrated solution. This reaction takes place in a nitrogen atmosphere. This reaction takes place slowly.