`[Fe(CN)_(6)]^(4-)` is a coordination complex ion.
Is the complex ion diamagnetic or paramagnetic ?

Explanation

To determine whether the complex ion \([Fe(CN)_6]^{4-}\) is diamagnetic or paramagnetic, we need to analyze the electronic configuration of the iron ion in this complex and the effect of the ligands.

### Step-by-Step Solution:

1. **Identify the oxidation state of iron (Fe):**
- The complex ion has a charge of \(-4\).
- Each cyanide ion \((CN^-)\) has a charge of \(-1\), and there are 6 cyanide ions.
- Let the oxidation state of iron be \(x\).
...