Identify the following:
(i) Oxoanion of chromium which is stable in acidic medium
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The correct answer is - Cr₂O₇²⁻.Oxoanions of metals are compounds where the metals form bonds with the oxygen atom. Therefore, they are available in their highest oxidation states.
Dichromate salts have the dichromate anion represented as Cr₂O₇²⁻. Chromium has an oxidation state of +6. It is an oxidizing agent which is moderately strong and it is weaker base when compared with the chromate ion.