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In K<sub>3</sub>[Fe(C<sub>2</sub>O<sub>4</sub>)<sub>3</sub>], oxalate is bidentate. The coordination number of iron is:

Answer: 6.

  • A 6
  • B 4
  • C 5
  • D 3

Correct answer: A. 6

Explanation: Each oxalate (C<sub>2</sub>O<sub>4</sub><sup>2-</sup>) is bidentate, donating 2 pairs. Three oxalates give 3 x 2 = 6 coordinate bonds, so the coordination number is 6.

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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