$[Fe(CN)_6 ]^{3-}$ ion is
- hexacyanoferrate (II) ion
- hexacyanoferrate (III) ion
- hexacyanide iron (III) ion
- iron (III) hexacyanide ion
The Correct Option is B
Solution and Explanation
The correct option is(B): hexacyanoferrate (III) ion.
Each cyanide ligand (CN−) carries a charge of -1. Since there are six cyanide ligands, they contribute a total charge of -6 (6×−1=−66×−1=−6).
The overall charge of the 3−[Fe(CN)6]3− complex ion is -3. This means that the iron atom must have a positive oxidation state to balance the negative charge of the ligands.
Let's assume that the oxidation state of iron is x:
Charge of iron ion (Fex+) + Charge of cyanide ligands (6×−16×−1) = Overall charge of the complex ion (−3−3)
x+(−6)=−3
Solving for x, we get x=+3.
The oxidation state of iron in the complex is +3. According to the IUPAC naming convention for coordination compounds, the name should reflect both the metal's oxidation state and the ligands. In this case, the iron has an oxidation state of +3, and the ligands are cyanide ions. Therefore, the correct name is "hexacyanoferrate (III) ion."
So, the correct option is "hexacyanoferrate (III) ion."
Top Questions on coordination compounds
- If \( a_0 \) is denoted as the Bohr radius of the hydrogen atom, then what is the de-Broglie wavelength \( \lambda \) of the electron present in the second orbit of hydrogen atom? (\( n \): any integer)
- JEE Main - 2025
- Chemistry
- coordination compounds
The structure of the major product formed in the following reaction is:
- JEE Main - 2025
- Chemistry
- coordination compounds
- The metal ion whose electronic configuration is not affected by the nature of the ligand and which gives a violet color in non-luminous flame under hot condition in borax bead test is:
- JEE Main - 2025
- Chemistry
- coordination compounds
- The strongest acid among the following is:
- VITEEE - 2024
- Chemistry
- coordination compounds
Identify the optically active compound from the following.
- GUJCET - 2024
- Chemistry
- coordination compounds
Concepts Used:
Coordination Compounds
A coordination compound holds a central metal atom or ion surrounded by various oppositely charged ions or neutral molecules. These molecules or ions are re-bonded to the metal atom or ion by a coordinate bond.
Coordination entity:
A coordination entity composes of a central metal atom or ion bonded to a fixed number of ions or molecules.
Ligands:
A molecule, ion, or group which is bonded to the metal atom or ion in a complex or coordination compound by a coordinate bond is commonly called a ligand. It may be either neutral, positively, or negatively charged.