A) purple colour
B) black colour
C) blood-red colour
D) white colour
Correct Answer: A
Solution :
Key Idea: \[\underset{From\text{ }organic\text{ }compound}{\mathop{N{{a}_{2}}S}}\,\,+\underset{sodium\text{ }nitroprusside}{\mathop{N{{a}_{2}}\,[Fe\,{{(CN)}_{5}}NO]}}\,\xrightarrow{{}}\] \[\underset{violet\text{ }colour}{\mathop{N{{a}_{4}}[Fe\,\,{{(CN)}_{5}}NOS]}}\,\] In the same test blood red colours is produced when N and S both are there
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