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Which coordination compound was historically important in proving Werner's theory?

Answer: [Co(NH3)6]Cl3 and its series of Co-NH3-Cl complexes.

  • A [Co(NH3)6]Cl3 and its series of Co-NH3-Cl complexes
  • B NaCl, a simple ionic salt with no coordinate covalent bonding
  • C [Pt(CN)4]2-, a square planar complex unrelated to Werner's original series
  • D K4[Fe(CN)6], the separate potassium ferrocyanide salt

Correct answer: A. [Co(NH3)6]Cl3 and its series of Co-NH3-Cl complexes

Explanation: Werner's studies on cobalt-ammonia complexes (e.g., [Co(NH3)6]Cl3, [Co(NH3)5Cl]Cl2, etc.) established the concept of primary and secondary valence.

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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