Coordination Compounds Ques 11
11. According to IUPAC nomenclature sodium nitroprusside is named as
[2003]
(a) Sodium pentacyanonitrosyl ferrate (III)
(b) Sodium nitroferrocyanide
(c) Sodium nitroferrocyanide
(d) Sodium pentacyanonitrosyl ferrate (II)
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Answer:
Correct Answer: 11.(a)
Solution:
(a) IUPAC name of sodium nitroprusside $Na_2[Fe(CN)_5 NO]$ is sodium pentacyanonitrosoyl ferrate (III) because in it NO is neutral ligand. Hence
$2 \times$ O.N. of $Na+$ O.N. of $Fe+5 \times$ O.N. of CN
$\hspace{40mm} 1 \times$ O.N. of $NO=0$
$2 \times(+1)+$ O.N. of Fe $+5 \times(-1)+1 \times 0=0$
O.N. of $Fe=5-2=+3$, Hence, ferrate (III)
BETA
