Question
According to IUPAC nomenclature sodium nitroprusside is named as
A.
sodium pentacyanonitrosyl ferrate (II)
B.
sodium pentacyanonitrosyl ferrate (III)
C.
sodium nitroferricyanide
D.
sodium nitroferrocyanide
Answer :
sodium pentacyanonitrosyl ferrate (III)
Solution :
IUPAC name of sodium nitroprusside $$N{a_2}\left[ {Fe{{\left( {CN} \right)}_5}NO} \right]$$ is sodium pentacyanoni trosyl ferrate (III) because in it $$NO$$ is neutral ligand and the oxidation number of $$Fe$$ is + 3. Which is calculated as
$$\eqalign{
& N{a_2}\left[ {Fe{{\left( {CN} \right)}_5}NO} \right] \cr
& 2 \times \left( { + 1} \right) + x + 5 \times \left( { - 1} \right) + 1 \times 0 = 0 \cr
& \,\,\,\,\,\,{\text{[where }}x{\text{ }} = {\text{ oxidation state of }}Fe{\text{]}} \cr
& 2 + x - 5 = 0 \cr
& \,\,\,\,\,\,\,\,\,x - 3 = 0 \cr
& \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,x = + 3 \cr} $$