Answer: 4.
- A 0
- B 2
- C 1
- D 4
Correct answer: D. 4
Explanation: Co3+ is d6; F- is a weak field ligand, so it is high spin t2g4eg2 with 4 unpaired electrons (unlike low-spin [Co(NH3)6]3+).
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.