Determine the oxidation number (O.N) of Fe in `[Fe(CN)_(6)]^(4-)`

Explanation

To determine the oxidation number (O.N) of Fe in the complex ion \([Fe(CN)_{6}]^{4-}\), we can follow these steps:

### Step 1: Identify the oxidation number of the ligands
The ligand in this complex is cyanide (CN). The oxidation number of CN is \(-1\).

### Step 2: Set up the equation for the oxidation number of Fe
Let the oxidation number of Fe be \(x\). Since there are six cyanide ligands, their total contribution to the charge will be \(6 \times (-1) = -6\).

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