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Minerals, Ores and their Formation

A complex com...

Question

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

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

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

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

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

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Solution

The correct option is A $[N i (C O)_{4}]$
The oxidation number of $N i$ in $[N i (C O)_{4}]$ is zero.
Let $x$ be the oxidation number of $N i$ in $[N i (C O)_{4}]$
$x + 4 (0) = 0$
$x = 0$

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