A) sodium pentacyanonitrosyl ferrate (II)
B) sodium pentacyanonitrosyl ferrate (III)
C) sodium nitroferricyanide
D) sodium nitroferrocyanide
Correct Answer: B
Solution :
IUPAC name of sodium nitroprusside \[N{{a}_{2}}[Fe\,{{(CN)}_{5}}NO]\] is sodium pentacyanonitrosoyl ferrate (III) because in it NO is neutral ligand and the O.N. of Fe is III. Which is calculated as- \[2\times O.N.\,of\,Na+O.N.\,of\,Fe+5\times O.N.of\,CN\] \[+1\times O.N.\,of\,NO=0\] \[2\times (+1)+O.N.\,of\,Fe+5\times (-1)+1\times 0=0\] \[O.N.\,of\,Fe=5-2=+3\]
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