Answer: Fe4[Fe(CN)6]3 (mixed valence Fe2+/Fe3+ complex with CN- bridges).
- A Fe4[Fe(CN)6]3 (mixed valence Fe2+/Fe3+ complex with CN- bridges)
- B A simple aqueous CuSO4 solution with little iron present according to conventional understanding
- C Plain FeCl3 dissolved in water with little cyanide bridges
- D K3[Fe(CN)6], the separate potassium ferricyanide salt in routine practice
Correct answer: A. Fe4[Fe(CN)6]3 (mixed valence Fe2+/Fe3+ complex with CN- bridges)
Explanation: Prussian blue is iron(III) hexacyanoferrate(II), a coordination network used as a blue pigment and in detoxification of heavy metals.
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.