A) \[N{{a}_{4}}[Fe{{(CN)}_{6}}S]\]
B) \[N{{a}_{4}}[Fe{{(CN)}_{5}}NCS]\]
C) \[N{{a}_{4}}[Fe{{(CN)}_{5}}NOS]\]
D) \[N{{a}_{2}}[Fe{{(CN)}_{5}}NOS]\]
E) \[N{{a}_{4}}[Fe{{(CN)}_{5}}S]\]
Correct Answer: C
Solution :
Sodium thionitroprusside,\[N{{a}_{4}}[Fe{{(CN)}_{5}}NOS]\] gives violet colour in Lassagines test for sulphur with sodium nitroprusside. \[\underset{\text{sodium}\,\,\text{extract}}{\mathop{N{{a}_{2}}S}}\,+\underset{\text{sodium}\,\,\text{nitroprusside}}{\mathop{N{{a}_{2}}[Fe{{(CN)}_{5}}NO]}}\,\xrightarrow{{}}\]\[\underset{\text{purple}\,\,\text{(violet)}\,\,\text{colour}}{\mathop{N{{a}_{4}}[Fe{{(CN)}_{5}}NOS]}}\,\]
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