Question:
On treating the sodium fusion extract with sodium nitroprusside, the blood red colour is formed due to the formation of}
On treating the sodium fusion extract with sodium nitroprusside, the blood red colour is formed due to the formation of}
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Sodium nitroprusside test is used for sulfur detection in Lassaigne’s test, giving a coloured complex ion.
Updated On: Apr 24, 2026
- PbS
- NaCN
- SCN
- \([Fe(SCN)]^{2+}\)
- \([Fe(CN)_5NOS]^{4-}\)
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The Correct Option is
Solution and Explanation
In Lassaigne’s test, sulfur in sodium fusion extract forms sulfide ion.
When treated with sodium nitroprusside, the sulfide ion gives a violet or blood-red coloured complex:
\[
[Fe(CN)_5NOS]^{4-}
\]
Therefore, the coloured species formed is:
\[
\boxed{[Fe(CN)_5NOS]^{4-}}
\]
Hence, the correct answer is: \[ \boxed{(E)} \]
Hence, the correct answer is: \[ \boxed{(E)} \]
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