The IUPAC name of the coordination compound $\mathrm{K}_{3}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]$ is

(B) Potassium hexacyanoferrate (III)

(A) Potassium hexacyanoferrate (II)

(C) Potassium hexacyanoiron (II)

(D) tripotassium hexcyanoiron (II)

JEE Main · 2005 · 08 May 2005 · Offline · Coordination Compounds

The IUPAC name of the coordination compound

K_{3} [Fe (CN)_{6}]

(A)Potassium hexacyanoferrate (II)
(B)Potassium hexacyanoferrate (III)✓ Correct
(C)Potassium hexacyanoiron (II)
(D)tripotassium hexcyanoiron (II)

Answer: (B)

Solution

Naming

K X_{3} [Fe (CN) X_{6}]

starts with the metal's oxidation state: three potassiums at

+ 1

and six cyanides at

- 1

in a neutral compound require iron at

+ 3

. The potassium cation is named first, then the ligands, six cyanides giving hexacyano, and because the complex ion is an anion the metal takes the Latin -ate ending with its oxidation state in Roman numerals, ferrate(III). Put together, the name reads potassium hexacyanoferrate(III).

JEE Main · 2005 · 08 May 2005 · Offline · Single correct option

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