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Chromo-chromic Oxides

Two hydrated oxides, Cr3O4.H2O and 2Cr3O4.4H2O, are said to exist, the former being described by Peligot as a product of the action of heat on chromous hydroxide, while the latter is obtained as a yellowish-brown powder with vigorous reducing properties, stable in dry air, but decomposed on heating, by the decomposition of the double chromous potassium carbonate with boiling water in absence of air. The existence of an oxide, of composition 2CrO.CrO3 or 3CrO.CrO3 described by Bunsen, has not been confirmed.

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