CBSE Class 12 Chemistry — Coordination Compounds

The secondary valency of Co in the complex [Co(NH₃)₅(NO₂)]²⁺ is

(a) Write IUPAC names of the following coordination compounds: (2 × 1) (i) [Ag(NH₃)₂] [Ag(CN)₂] (ii) K₃[Fe(C₂O₄)₃] OR (b) (i) Give a chemical test to show that [Co(NH₃)₅SO₄]Cl and [Co(NH₃)₅Cl]SO₄ are ionisation isomers. (2 × 1) (ii) What is meant by the 'Chelate effect'? Give an example.

(a) In octahedral crystal field, energies of which d-orbitals will be raised when ligands approach the central metal atom/ion? Give reason in support of your answer.

(b) Using crystal field theory, write the electronic configuration of central metal atom/ion of the following: (i) [CoF₆]³⁻ (ii) [Co(NH₃)₆]³⁺ [At. No.: $\text{Co} = 27$]

(c) $[NiCl_4]^{2-}$ is paramagnetic while $[Ni(CO)_4]$ is diamagnetic though both are tetrahedral. Why? [Atomic No.: $Ni = 28$] OR (c) Write hybridization and magnetic behaviour of the complex $[Fe(CN)_6]^{3-}$. [Atomic No.: $Fe = 26$]