How would you account for the following :
`[Fe(CN)_6]^(3-)` is weakly paramagnetic while `[Fe(CN)_6]^(4-)` is diamagnetic

Explanation

To account for the magnetic properties of the complexes \([Fe(CN)_6]^{3-}\) and \([Fe(CN)_6]^{4-}\), we need to analyze the oxidation states of iron in these complexes and the resulting electron configurations.

### Step-by-Step Solution:

1. **Determine the Oxidation State of Iron:**
- For \([Fe(CN)_6]^{4-}\):
- Let the oxidation state of iron be \(x\).
- The cyanide ion (CN) has a charge of \(-1\) and there are 6 cyanide ions.
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