A) \[N{{a}_{4}}[Fe{{(CN)}_{5}}NOS]\]
B) \[N{{a}_{3}}[Fe{{(CN)}_{5}}NOS]\]
C) \[N{{a}_{2}}[Fe{{(CN)}_{5}}NOS]\]
D) \[N{{a}_{2}}[Fe{{(CN)}_{5}}NO]\]
Correct Answer: A
Solution :
When \[N{{a}_{2}}S\] is mixed with freshly prepared sodium nitroprusside, a deep violet colour indicates the presence of sulphur. \[N{{a}_{2}}S+N{{a}_{2}}\underset{sodium\,\,nitroprusside}{\mathop{[Fe(NO){{(CN)}_{5}}]}}\,\] \[\underset{\begin{smallmatrix} sodium\,\,thionitro\,\,prusside \\ violet\,\,coloured\,\,complex \end{smallmatrix}}{\mathop{N{{a}_{4}}[Fe{{(CN)}_{5}}NOS]}}\,\]
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