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A complex compound in which the oxidation number of a metal is zero, is
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The correct answer is:
$\left[\mathrm{Ni}(\mathrm{CO})_{4}\right]$
The oxidation number of Ni metal is zero in complex $\mathrm{Ni}(\mathrm{CO})_{4}$. As $\mathrm{CO}$ is a neutral ligand i.e., $\Rightarrow \mathrm{Ni}(\mathrm{CO})_{4}$
$\begin{array}{r}
x+4(0)=0 \\
x=0
\end{array}$
$\begin{array}{r}
x+4(0)=0 \\
x=0
\end{array}$
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