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Q. In $Na _2\left[ Fe ( CN )_5 NO \right]$, sodium nitroprusside,

The d-and f-Block Elements

Solution:

$ NO \rightarrow NO ^{+}+e^{-} $
$ Fe ^{3+}+e^{-} \rightarrow Fe ^{2+}$
Oxidation state of $Fe$ is $+2$ and $NO ^{+}$is ligand