A) Red colouration
B) Blue colouration
C) Purple colouration
D) Brown colouration
Correct Answer: C
Solution :
Sodium nitroprusside test: \[N{{a}_{2}}S+\underset{\text{Sodium}\,\text{nitro}\,\text{prusside}}{\mathop{N{{a}_{2}}[Fe{{(CH)}_{5}}NO]}}\,\to \underset{\begin{smallmatrix} \text{Purple}\,\text{colouration} \\ \text{Sodium}\,\text{thiornitroprusside} \end{smallmatrix}}{\mathop{\text{N}{{\text{a}}_{\text{4}}}\text{ }\!\![\!\!\text{ Fe(CN}{{\text{)}}_{\text{5}}}\text{NOD }\!\!]\!\!\text{ }}}\,\] Hence, the correct option is (c).
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