Chromic Selenite, Cr₂O₃.3SeO₂

Chromic Selenite, Cr₂O₃.3SeO₂, is precipitated as a pale green substance, insoluble in water, when potassium selenite is added to a boiling solution of chromic chloride. If the latter contain excess of hydrochloric acid, the sparingly soluble diselenite, Cr₂O₃.6SeO₂, is also formed.

Chromic Selenate itself has not been isolated, but double salts (which are alums) of the type Cr₂(SeO₄)₃.R^•₂SeO₄.24H₂O are known, as well as those of the type Cr₂(SeO₄)₃.R^•₂SO₄.24H₂O.