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Chromous Bromide, CrBr2

Chromous Bromide, CrBr2, is obtained by passing hydrogen bromide, or nitrogen saturated with bromine vapour, over strongly heated chromium, or by heating chromic bromide in hydrogen. It is a white crystalline solid, which becomes yellowish on fusion and yields a green basic chromic bromide on exposure to air. It is soluble in water, forming a blue solution which can dissolve large quantities of violet chromic chloride, and which rapidly absorbs oxygen from the air. The solution may be prepared by heating a dilute solution of chromic acid with hydrobromic acid and reducing with zinc.

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