Detection of sulphur in sodium extract (Lassaigne test) is not done by which of the following reagents ?

P b (O A C)_{2}

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Sodium nitroprusside

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Both

P b (O A C)_{2}

and sodium nitroprusside

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Silver nitrate

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Solution

The correct option is D Silver nitrate
Detection of sulphur in sodium extract is done by both $P b (O A c)_{2}$ and sodium nitroprusside.
$N a_{2} S + (O A c)_{2} P b l e a d a c e t a t e \to P b S b l a c k p p t + 2 A c O N a$
$N a_{2} S + N a_{2} [F e (C N)_{5} (N O)] \to N a_{4} [F e (C N)_{5} (N O S)] v i o l e t c o l o u r$
Detection of sulphur is not done by silver nitrate rather it is done by potassium nitrate and sodium carbonate.
$K N O_{3} Δ \to K N O_{2} + O$
$N a_{2} C O_{3} + s + 3 [O] Δ \to N a_{2} S O_{4} + C O_{2}$

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