10Oxidation Reduction Redox EquationsMedium1 markWhich statement about the dichromate ion, Cr2O72−, is correct?AIt acts as an oxidising agent when it gains electrons.BIt is formed when the CrO42− ion disproportionates into two chromium containing products.CThe oxidation number of chromium is +12.DThe sum of the oxidation numbers of all the chromium and oxygen atoms is zero.Grade answerSolutionGrading criteria