Which statement is correct for the transition metal complex [Cr(ox)2(H2O)2]−[\text{Cr(ox)}_2(\text{H}_2\text{O})_2]^-[Cr(ox)2(H2O)2]−, where ox\text{ox}ox represents the bidentate ethanedioate (oxalate) ligand, C2O42−\text{C}_2\text{O}_4^{2-}C2O42−?
The oxidation state of chromium is +1+1+1 and its coordination number is 666.
The oxidation state of chromium is +3+3+3 and its coordination number is 444.
It exhibits cis\text{cis}cis-trans\text{trans}trans isomerism and the cis\text{cis}cis-isomer can exist as a pair of enantiomers.
The oxidation state of chromium is +3+3+3 and it cannot exhibit optical isomerism.
48 exam-style questions on OCR A A Level Chemistry Transition elements. Each one has a worked solution and a mark scheme showing where the marks go.