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  4. A complex compound in which the oxidation number of a metal is zero is

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Q. A complex compound in which the oxidation number of a metal is zero is

KCETKCET 2008Coordination Compounds

Solution:

$CO$ is a neutral ligand, so the oxidation state of metal in metal carbonyls is always zero.

$\left[N i(C O)_{4}\right]$

$x+(0 \times)=0$

$x=0$