The violet color obtained in the Lassaigne's | vedclass

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Question

(B) In the Lassaigne's test,when both nitrogen and sulfur are present in an organic compound,sodium thiocyanate $(NaSCN)$ is formed.When this is treat

Vedclass · Accepted Answer

$[Fe(CN)_5NOS]^{4-}$

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(B) In the Lassaigne's test,when both nitrogen and sulfur are present in an organic compound,sodium thiocyanate $(NaSCN)$ is formed.When this is treated with ferric chloride $(FeCl_3)$,it forms a blood-red colored complex,$[Fe(SCN)]^{2+}$.However,if the question refers to the violet color specifically formed in the presence of sodium nitroprusside $(Na_2[Fe(CN)_5NO])$ during the test for sulfur,the reaction is:$S^{2-} + [Fe(CN)_5NO]^{2-} \rightarrow [Fe(CN)_5NOS]^{4-}$This complex,sodium thio-nitroprusside,is violet in color.

The violet color obtained in the Lassaigne's test for a sulfur-containing compound is due to the formation of which species?

Similar Questions

Which of the products indicates the presence of sulphur atom in an organic compound,in qualitative elemental analysis?

An organic compound $A$ is oxidized with $Na_2O_2$ followed by boiling with $HNO_3$. The resultant solution is then treated with ammonium molybdate to yield a yellow precipitate. Based on the above observation,the element present in the given compound is:

The Lassaigne test is used for the detection of which of the following elements?

Lassaigne's test is used for the detection of:

The Beilstein test is used for the detection of:

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