Question

Co²⁺ is easily oxidized to Co³⁺ in the presence of a strong ligand (At. No. of Co = 27).

Hint:

Strong field ligands can stabilize high oxidation states, like Co\(^{3+}\), by creating a strong ligand field.

Answer 1

The complex \([\text{Co(NH}_3)_6][\text{Cr(CN)}_6]\) exhibits ionization isomerism

In ionization isomerism, two different compounds have the same molecular formula but differ in the way the ions are arranged. One of the isomers will have the ion \([\text{Cr(CN)}_6]^{3-}\) as the anion, while the other will have the ion \([\text{Co(NH}_3)_6]^{3+}\) as the anion.

The difference in the arrangement of ions leads to the formation of different ions in solution, which are responsible for the isomerism.