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Nickel Dichromate, NiCr2O7.1.5H2O

Nickel Dichromate, NiCr2O7.1.5H2O, has been prepared4 by boiling a mixture of nickel carbonate and chromic acid in aqueous solution; it crystallises in reddish-brown transparent prisms, which are deliquescent. It readily forms addition compounds with organic bases; for example, pyridine yields NiCr2O7.4C5H5N. The double salt, NiCr2O7.2Hg(CN)2.7H2O, has been described. Nickel trichromate has only been obtained in the amorphous condition.

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