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Question:

The name of complexion, [Fe(CN)6]³⁻ is:

Tricyanoferrate (III) ion

Hexacyanidoferrate (III) ion

Hexacyanoiron (III) ion

Hexacyanitoferrate (III) ion

Solution:

The iron atom is in +3 oxidation state. The oxidation state of iron is written in roman numerals in parenthesis. Six cyanide ligands are present which are written as hexacyanido. The name of complexion, [Fe(CN)6]³⁻ is Hexacyanidoferrate (III) ion. Hence, option B is correct.