Q. In Lassaigne's solution, pink/violet colouration is produced when sodium nitroprusside solution is added. It indicates the presence of
A) Sulphur
B) Nitrogen
C) Chlorine
D) None of these
Explanation
(a)
$Na_{2}S + Na_{2}\lbrack Fe(CN)_{5}NO\rbrack \rightarrow Na_{4}\lbrack Fe(CN)_{5}NOS\rbrack$
Sod. extract pink/violet colour
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.