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According to IUPAC nomenclature sodium nitroprusside is named as:
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The correct answer is:
sodium pentacyanonitrosyl ferrate (II)
Sodium nitroprusside
$$
\mathrm{Na}_2\left[\mathrm{Fe}\left(\mathrm{CN}_5\right) \mathrm{NO}\right]
$$
Let oxidation state of $\mathrm{Fe}$ is $x$ in this compound.
$$
\begin{aligned}
& +2+x+(-1) 5+1=0 \\
& \text { or }+2+x-5+1=0 \text { or } x=+2
\end{aligned}
$$
Thus IUPAC name of sodium nitroprusside is sodium pentacyanonitrosyl ferrate (II)
$$
\mathrm{Na}_2\left[\mathrm{Fe}\left(\mathrm{CN}_5\right) \mathrm{NO}\right]
$$
Let oxidation state of $\mathrm{Fe}$ is $x$ in this compound.
$$
\begin{aligned}
& +2+x+(-1) 5+1=0 \\
& \text { or }+2+x-5+1=0 \text { or } x=+2
\end{aligned}
$$
Thus IUPAC name of sodium nitroprusside is sodium pentacyanonitrosyl ferrate (II)
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