Answer: d²sp³ inner orbital.
- A sp³ tetrahedral
- B dsp² square planar
- C sp³d² outer orbital
- D d²sp³ inner orbital
Correct answer: D. d²sp³ inner orbital
Explanation: NH₃ is a strong-field ligand, so Co³⁺ (d⁶) pairs its electrons and uses inner (n−1)d orbitals: d²sp³, giving a low-spin octahedral complex.
The three common coordination geometries: octahedral (6 ligands), tetrahedral (4 ligands), and square planar (4 ligands in one plane).
Concept context
Study of compounds where a central metal atom is bonded to surrounding ligands. Covers nomenclature, types of isomerism, bonding theories (VBT, CFT), and applications in medicine, photography, and industry.