Find the oxidation number of Ni in $[N i (C N)_{6}]^{4 -}$ .

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Solution

Let X be the oxidation number of Ni in $[N i (C N)_{6}]^{4 -}$ .
The oxidation number of cyano group is -1.
$= X + 6 (- 1) = - 4$
$= X - 6 = - 4$
$= X = 6 - 4$
$X = + 2$
The oxidation number of Ni in $[N i (C N)_{6}]^{4 -}$ is $+ 2$ .

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