The IUPAC name of $K_4[Fe(CN)_6]$ is:
APotassium ferrocyanide
BPotassium hexacyanoferrate(II)
CPotassium hexacyanoferrate(III)
DPotassium ferricyanide
Answer & Solution
Correct answer: B. Potassium hexacyanoferrate(II)
Anionic complex with Fe(+2) and 6 CN⁻: 'hexa' (6) + 'cyano' (CN) + 'ferrate' (Fe in anion) + (II) (oxidation state) ⇒ potassium hexacyanoferrate(II). 'Ferrocyanide' is the older/common name.
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