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  4. Oxidation number of Ni in Ni ( CO )4 is:

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Q. Oxidation number of $Ni$ in $Ni ( CO )_{4}$ is:

Delhi UMET/DPMTDelhi UMET/DPMT 2001

Solution:

Oxidation state of metal in carbonyl is always zero.
$\therefore $ Oxidation state of $N i$ in $N i(C O)_{4}$ is zero.