This question is about d-block elements, their complexes, and redox chemistry.
The 1,2-diaminoethane molecule, H2NCH2CH2NH2\text{H}_2\text{NCH}_2\text{CH}_2\text{NH}_2H2NCH2CH2NH2, is a neutral bidentate ligand. A complex ion of chromium(III) contains two 1,2-diaminoethane ligands and two hydroxide ligands, OH−\text{OH}^-OH−. 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.
