Which statement about transition metals and their complexes is not correct?
The reaction of [Cu(H2O)6]2+[\text{Cu}(\text{H}_2\text{O})_6]^{2+}[Cu(H2O)6]2+ with excess concentrated HCl\text{HCl}HCl results in a change in coordination number from 6 to 4 because chloride ligands are larger than water molecules.
The substitution of monodentate ligands by multidentate ligands like EDTA4−\text{EDTA}^{4-}EDTA4− is thermodynamically highly favourable because the reaction is strongly exothermic (ΔH⊖≪0\Delta H^{\ominus} \ll 0ΔH⊖≪0).
Zinc is not classified as a transition metal because neither the metal nor its common stable ion (Zn2+\text{Zn}^{2+}Zn2+) has an incomplete d-subshell.
The splitting of the d-orbitals in transition metal complexes depends on the oxidation state of the metal, the identity of the metal, and the nature of the ligands.
63 exam-style questions on AQA A Level Chemistry Transition metals (A-level only), covering General properties of transition metals (A-level only), Substitution reactions (A-level only), Shapes of complex ions (A-level only), Formation of coloured ions (A-level only), Variable oxidation states (A-level only), and Catalysts (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.