KCET2026ChemistryCoordination Compounds
Match List-I with List-II List-I (Complex) List-II (Geometry) (a) [ Co(NH ₃ ) ₆]³⁺ (i) Trigonal bipyramidal (b) [ NiCl ₄]²⁻ (ii) Octahedral (c) [ Ni(CN) ₄]²⁻ (iii) Tetrahedral (d) [ Fe(CO) ₅] (iv) Square planar Choose the correct answer from the options given below.
Options
- Aa-ii, b-iii, c-iv, d-i
- Ba-ii, b-i, c-iii, d-iv
- Ca-iii, b-ii, c-iv, d-i
- Da-i, b-iii, c-iv, d-ii
Correct answer
A. a-ii, b-iii, c-iv, d-i
Step-by-step solution
For [ Co(NH ₃ ) ₆]³⁺ , the coordination number is 6 , which corresponds to an octahedral geometry. Thus, (a) matches with (ii). For [ NiCl ₄]²⁻ , Ni is in the +2 oxidation state with a 3d^8 configuration. Since Cl ^- is a weak field ligand, no pairing occurs, leading to sp^3 hybridization and a tetrahedral geometry. Thus, (b) matches with (iii). For [ Ni(CN) ₄]²⁻ , Ni is in the +2 oxidation state with a 3d^8 configuration. Since CN ^- is a strong field ligand, pairing of electrons occurs, leading to dsp^2 hybridiza