MHT CET Medical202623 April 2026Morning ShiftChemistryCoordination CompoundsActual
What is the correct IUPAC name of K ₃[ Fe(CN) ₆] ?
Options
- APotassium hexacyanoferrate(II)
- BPotassium hexacyanoferrate(III)
- CPotassium ferricyanide
- DPotassium ferrocyanide
Correct answer
B. Potassium hexacyanoferrate(III)
Step-by-step solution
The given coordination compound is K ₃[ Fe(CN) ₆] . The cation is potassium and the complex anion is [ Fe(CN) ₆]³⁻ . Let the oxidation state of iron (Fe) be x . The charge on each cyanide (CN) ligand is -1 . Equating the sum of oxidation states to the charge on the complex ion: x + 6(-1) = -3 x - 6 = -3 x = +3 The complex anion contains six cyanide ligands, which are named as 'hexacyano'. Since the complex is an anion, the suffix '-ate' is added to the Latin name of iron, making it 'ferrate'. The oxidation state is