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

K_{4} [F e {(C N)}_{6}]

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K_{3} [F e {(C N)}_{6}]

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[N i {(C O)}_{4}]

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[P l {(N H_{3})}_{4}] {C l}_{2}

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Solution

The correct option is D $[N i {(C O)}_{4}]$
A complex compound in which the oxidation number of metal is zero is $[N i {(C O)}_{4}]$ . In this complex, the oxidation number of both metal and ligand is zero.
The oxidation number of metal in the complexes $K_{4} [F e {(C N)}_{6}]$ , $K_{3} [F e {(C N)}_{6}]$ and $[P t {(N H_{3})}_{4}] {C l}_{2}$ are $+ 2$
$+ 3$ and $+ 2$ respectively.

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Stable complex based on EAN rule:

i) $K_{4} [F e (C N)_{6}]$

ii) $[C o (N H_{3})_{5} C l] C l_{2}$

iii) $[N i (C O)_{4}]$

iv) $K_{2} [N i (C N)_{4}]$

K_{4} [F e {(C N)}_{6}]

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