Question

$K_3\left[Fe\right(CN{)}_6]$ is
(a) Potassium hexacyano ferrate (II)
(b) Potassium hexacyano ferrate (III)
(c) Potassium ferri-cyanide
(d)Hexacyano ferrate (III) potassium
Correct answer is:

• A. Only (a) and (b)
• B. Only (b) and (c)
• C. Only (a) and (c)
• D. Only (b) and (d)

Answer 1

The correct option is B Only (b) and (c)

The IUPAC nomenclature of the given complex is Potassium hexacyano ferrate (III) because the oxidation sate of the metal ion in the complex is +3 and the name of counter cation is written before the name of the complex.The complex is also known as Potassium ferri-cyanide because Fe in +3 oxidation state is called ferri. Therefore option B is correct.