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🧪 Chemistry  ·  Coordination Compounds  ·  NEET & JEE

The stability constant (formation constant) Kf of a complex indicates:

Answer: The extent to which the complex forms in solution (higher Kf = more stable).

  • A The extent to which the complex forms in solution (higher Kf = more stable)
  • B The specific colour the complex displays once largely formed under usual circumstances
  • C The melting point of the solid complex once isolated according to most researchers
  • D The overall molecular weight of the formed complex in the majority of cases studied

Correct answer: A. The extent to which the complex forms in solution (higher Kf = more stable)

Explanation: Kf = [complex] / ([metal ion][ligand]<sup>n</sup>); a high Kf means the complex dissociates very little and is very stable.

Octahedralcoordination no. 6e.g. [Co(NH3)6]3+Tetrahedralcoordination no. 4e.g. [Ni(CO)4]Square Planarcoordination no. 4e.g. [Pt(NH3)2Cl2]

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.

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