$0=2+2 x-6$
$x=2$
In the complex $K _2 Fe \left[ Fe ( CN )_6\right]$, both the iron atoms have $+2$ oxidation state.
Since six cyanide ions surround the iron atom, its coordination number is 6 .
The $Fe ^{2+}$ ion in $\left[ Fe ( CN )_6\right]^{4-}$ has outer electronic configuration of $3 d ^6$. The complex is a low spin complex.It contains o unpaired electrons with the magnetic moment of o $B.M.$ and is colourless.
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$NO\,\xrightarrow{{{O_2}}}A \rightleftharpoons D$
$A\xrightarrow{{NaOH\,\,(aq.)}}[B + C]$