JEE Main · ChemistryEasy

$What is the IUPAC name of the complex K_{3} [Fe (CN)_{6}] ?$

A. $Potassium hexacyanoferrate(II)$
B. $Potassium hexacyanoferrate(III)$
C. $Potassium hexacyanoiron(III)$
D. $Tripotassium hexacyanoferrate(III)$

Show correct answer & step-by-step solution

Correct answer: B — $Potassium hexacyanoferrate(III)$

Solution

$The complex is K_{3} [Fe (CN)_{6}] .$
$The oxidation state of iron is $3(+1) + x + 6(-1) = 0$, so x = + 3 .$
$Since the complex ion is anionic, iron is named as ferrate.$
$The name is potassium hexacyanoferrate(III).$
$Hence the answer is (B).$

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