Selected the compounds having metal in zero oxidation state:

N i (C O)_{4}

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C r (C O)_{6}

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F e_{2} (C O)_{9}

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C o (C O)_{6}

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Solution

The correct options are
A $N i (C O)_{4}$
B $C r (C O)_{6}$
C $F e_{2} (C O)_{9}$
D $C o (C O)_{6}$
We know that $C O$ is a neutral ligand, its oxidation state in metal carbonyl is $0$ .

Since the overall charge is 0, the oxidation state of $N i$ in $N i (C O)_{4}$ , $C r$ in $C r (C O)_{6}$ , $F e$ in $F e_{2} (C O)_{3}$ and $C o$ in $C o (C O)_{6}$ will be 0.

Hence A, B, C and D are correct.

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