Question

Which of the following statements is not correct?

• A. The complexes ${[NiC{l}_4]}^{2-}$ and ${[Ni{(CN)}_4]}^{2-}$ differ in the state of hybridization of nickel
• B. The complexes ${[NiC{l}_4]}^{2-}$ and ${[Ni{(CN)}_4]}^{2-}$ differ in the magnetic properties
• C. The complexes ${[NiC{l}_4]}^{2-}$ and ${[Ni{(CN)}_4]}^{2-}$ differ in geometry
• D. The complexes ${[NiC{l}_4]}^{2-}$ and ${[Ni{(CN)}_4]}^{2-}$ differ in primary valencies of nickel
• E. Nickel ion has the same secondary valency in the complexes ${[NiC{l}_4]}^{2-}$ and ${[Ni{(CN)}_4]}^{2-}$

Answer 1

Answer: (D)

The primary valencies of $Ni,$ in the complexes ${[Ni(C{l}_4)]}^{2-}$ and ${[Ni(C{N}_4)]}^{2-}$ is same ie, $(+\text{II})$ . Primary valencies are those valencies in which a metal exhibits in the formation of its simple salt, these are non-directional. It is also referred as oxidation state of central metal atom.