With the help of crystal field theory, predict the number of unpaired electrons in `[Fe(CN)_(6)]^(4-)` and `[Fe(H_(2)O)_(6)]^(2+)` complexes.

Explanation

To determine the number of unpaired electrons in the complexes \([Fe(CN)_6]^{4-}\) and \([Fe(H_2O)_6]^{2+}\) using crystal field theory, we will follow these steps:

### Step 1: Determine the oxidation state of iron in each complex.
For \([Fe(CN)_6]^{4-}\):
- Let the oxidation state of iron be \(x\).
- The charge of cyanide (CN) is \(-1\), and there are 6 cyanide ligands.
- Therefore, the equation is:
\[
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