A) Red colouration
B) Blue colouration
C) Purple colouration
D) Brown colouration
Correct Answer: C
Solution :
\[N{{a}_{2}}S+\underset{\text{sodium}\,\,\text{nitroprusside}}{\mathop{N{{a}_{2}}[Fe(NO){{(CN)}_{5}}]}}\,\to \]\[\underset{\text{violet}\,\,\text{coloured}\,\,\text{complex}}{\mathop{N{{a}_{3}}[Fe(ONSNa){{(CN)}_{5}}]}}\,\] or \[\underset{\text{purple}\,\,\text{colour}\,\,\text{complex}}{\mathop{N{{a}_{4}}[Fe{{(CN)}_{5}}NOS]}}\,\]
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