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The oxidation state of iron in the compound [Fe(CO)5] is:

1. Zero oxidation state.
2. Negative oxidation state.
3. Positive oxidation state.
4. Variable oxidation states.

Correct answer: Zero oxidation state.

Solution

In [Fe(CO)5], carbon monoxide (CO) is a neutral ligand, and the oxidation state of iron is calculated as zero because the sum of charges on the complex is zero.

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