Answer: Hexacyanoferrate(II) ion.
- A Hexacyanoferrate(II) ion
- B Hexacyanoferrate(III) ion
- C Iron hexacyanide
- D Ferrocyanide
Correct answer: A. Hexacyanoferrate(II) ion
Explanation: Fe is in +2 oxidation state (hexacyanoferrate(II)): 6 CN- = -6; charge = -4; x - 6 = -4, x = +2.
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.