A) \[N{{a}_{3}}[Fe(ONSNa){{(CN)}_{5}}]\]
B) \[N{{a}_{2}}[Fe(NO){{(CN)}_{5}}]\]
C) \[N{{a}_{4}}[Fe{{(CN)}_{5}}NOS]\]
D) Both (a) and (c)
Correct Answer: D
Solution :
\[\text{N}{{\text{a}}_{\text{2}}}\text{S}\] on reaction with sodium nitroprusside gives violet colouration which slowly fades on standing as follows: \[\underset{\begin{smallmatrix} \text{From} \\ \text{Lassaigne }\!\!'\!\!\text{ s} \\ \text{extract} \end{smallmatrix}}{\mathop{N{{a}_{2}}S}}\,+\underset{\text{sodium}\,\text{nitroprusside}}{\mathop{N{{a}_{2}}[Fe{{(CN)}_{5}}(NO)]\to }}\,\] \[\underset{\text{Sodium}\,\text{thionitroprusside}}{\mathop{N{{a}_{3}}[Fe(ONSNa){{(CN)}_{5}}]}}\,\]or \[N{{a}_{4}}[Fe{{(CN)}_{5}}(NOS)]\] Hence, the correct option is (d).
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