(a) $Ni(CO)_4$, (b) $[Ni(CN_4)]^{2-}$ and (c) $[Pt(NH_3)_2Cl_2]$ are respectively ______ complexes.
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → (a) Tetrahedral, (b) square planar and (c) square planar
Let’s identify the geometry of each complex:
(a) Ni(CO)₄
- Ni is in 0 oxidation state (d¹⁰).
- Forms sp³ hybridization → tetrahedral geometry.
(b) [Ni(CN)₄]²⁻
- Ni²⁺ is d⁸.
- CN⁻ is a strong field ligand → pairing of electrons.
- Forms dsp² hybridization → square planar geometry.
(c) [Pt(NH₃)₂Cl₂]
- Pt²⁺ is d⁸.
- Pt(II) complexes are characteristically square planar.