This question is about d-block elements, their complexes, and redox chemistry.
The ethanedioate ion, C2O42−\text{C}_2\text{O}_4^{2-}C2O42−, is a bidentate ligand. A complex ion of chromium(III) contains one ethanedioate ligand and four fluoride ligands. Determine the charge of this complex ion and the coordination number of chromium in this complex ion.
An acidified solution containing dichromate(VI) ions, Cr2O72−\text{Cr}_2\text{O}_7^{2-}Cr2O72−, reacts with oxovanadium(IV) ions, VO2+\text{VO}^{2+}VO2+, in a redox reaction to form a solution containing chromium(III) ions, Cr3+\text{Cr}^{3+}Cr3+, and dioxovanadium(V) ions, VO2+\text{VO}_2^+VO2+. Construct the overall balanced ionic equation for this reaction.