A) sulphur
B) chlorine
C) nitrogen
D) None of these
Correct Answer: A
Solution :
\[\underset{\begin{smallmatrix} Sodium \\ extract \end{smallmatrix}}{\mathop{N{{a}_{2}}S}}\,\,+N{{a}_{2}}\left[ Fe{{\left( CN \right)}_{5}}\cdot NO \right] \xrightarrow{{}}\] \[N{{a}_{4}} [\underset{Pink\,colour}{\mathop{Fe{{\left( CN \right)}_{5}}}}\,NOS]\]
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