`[Fe(CN)_(6)]^(4-)` is a coordination complex ion.
Calculate the oxidation number of iron in the complex.

Explanation

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

### Step 1: Identify the charge of the complex ion
The overall charge of the complex ion \([Fe(CN)_{6}]^{4-}\) is \(-4\).

### Step 2: Determine the charge contributed by the ligands
Cyanide (CN) is a ligand that has a charge of \(-1\). Since there are 6 cyanide ligands in the complex, the total charge contributed by the cyanide ligands is:
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