Problem

Which of the following statement(s) is(are) correct? a. The complexes

[\text{NiCl}_4]^{2-}

and

[\text{NiCN}_4]^{2-}

differ in the magnetic properties b. The complexes

[\text{NiCl}_4]^{2-}

and

[\text{NiCN}_4]^{2-}

differ in the geometry c. The complexes

[\text{NiCl}_4]^{2-}

and

[\text{NiCN}_4]^{2-}

differ in primary valencies of nickel d. The complexes

[\text{NiCl}_4]^{2-}

and

[\text{NiCN}_4]^{2-}

differ in the state of hybridization of nickel