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In which of the following compounds does iron exhibit zero oxidation state?

1. [Fe(H2O)6](NO3)3
2. K4[Fe(CN)6]
3. [Fe(CN)6]3−
4. [Fe(CO)5]

Correct answer: [Fe(CO)5]

Solution

In [Fe(CO)5], iron exhibits a zero oxidation state because carbon monoxide (CO) is a neutral ligand, and the overall charge of the complex is zero.

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