Q. In sulphur detection of an organic compound, sodium nitroprusside solution is added to sodium extract. Formation of violet colour is due to
A) $Na_{3}Fe(CN)_{6}$
B) $Na_{3}\lbrack Fe(CN)_{5}NOS\rbrack$
C) $Fe(CNS)_{3}$
D) None of these
Explanation
(b)
(i) $Fe(CNS)_{3}$ is red in colour and is formed when both N and S are present in organic compound
(ii) $Na_{2}S + Na_{2}\left\lbrack Fe(CN)_{5}NO \right\rbrack \longrightarrow \left\lbrack NaFe(C)_{5}NOS \right\rbrack$
from organic sodium violet colour
compound nitroprusside
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.