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Question: Answered & Verified by Expert
A complex compound in which the oxidation number of a metal is zero, is
ChemistryCoordination CompoundsCOMEDKCOMEDK 2017
Options:
  • A $\mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]$
  • B $\mathrm{K}_{3}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]$
  • C $\left[\mathrm{Ni}(\mathrm{CO})_{4}\right]$
  • D $\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{4}\right] \mathrm{Cl}_{2}$
Solution:
1766 Upvotes Verified Answer
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., $\Rightarrow \mathrm{Ni}(\mathrm{CO})_{4}$
$\begin{array}{r}
x+4(0)=0 \\
x=0
\end{array}$

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