Structures (1), (2), (3) and (4) represent the [CoCl₂(NH₃)₄]⁺ complex. The black sphere represents Co³⁺, blue spheres represent NH₃, and red spheres represent Cl^–. Select from the list below the statement which identifies equivalent pairs of structures. 

[PtCl₄]^2– would be best represented by which of the energy level diagrams below?

Which transition metal in these complexes has five unpaired electrons?

From the options below select the coordination number and oxidation state of the central metal atom in [PtCl₂(en)].

Which of the following transition metal compounds has more than two isomers?

Select the correct numbers of unpaired electrons for iron(II) in small and large octahedral crystal field splittings.

From the list below select the correct molecular formula for the following complex: potassium hexacyanidoferrate(II)