Chromous Cyanide, Cr(CN)₂

Chromous Cyanide, Cr(CN)₂, is obtained as a white precipitate when aqueous potassium cyanide is added to a solution of chromous chloride. It is insoluble in excess of potassium cyanide, and is quickly oxidised in air to chromic cyanide and sesquioxide. It forms a series of double salts with metallic cyanides.