Q10 / 180 · KCET 2008 · Chemistry

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

  • A
    $\mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]$
  • B
    $\mathrm{K}_{3}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]$
  • Correct answer
    C
    $\left[\mathrm{Ni}(\mathrm{CO})_{4}\right]$
  • D
    $\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{4}\right] \mathrm{Cl}_{2}$

Solution

CO is a neutral ligand, so the oxidation state of metal in metal carbonyls is always zero. $$ \begin{array}{r} {\left[\mathrm{Ni}(\mathrm{CO})_{4}\right]} \\ \mathrm{x}+(0 \times 4)=0 \\ \mathrm{x}=0 \end{array} $$

Hence, the correct answer is option: 'C'.

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