Assertion : During the test for nitrogen with | vedclass

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Question

(A) When both nitrogen and sulphur are present in an organic compound,sodium thiocyanate $(NaSCN)$ is formed during the preparation of Lassaigne's ext

Vedclass · Accepted Answer

If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

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(A) When both nitrogen and sulphur are present in an organic compound,sodium thiocyanate $(NaSCN)$ is formed during the preparation of Lassaigne's extract.$Na + C + N + S \xrightarrow{\Delta} NaSCN$On adding $FeCl_3$ to this extract,the $Fe^{3+}$ ions react with $SCN^-$ ions to form ferric thiocyanate,which gives a blood-red coloration.$Fe^{3+} + 3SCN^- \longrightarrow [Fe(SCN)_3]$ (blood-red color)Thus,both the Assertion and the Reason are correct,and the Reason explains the Assertion.

Test	Inference
$a$. Dil. $HCl$	Insoluble
$b$. $NaOH$ solution	Soluble
$c$. $Br_2/\text{water}$	Decolourization

Assertion : During the test for nitrogen with Lassaigne's extract,on adding $FeCl_3$ solution,sometimes a blood-red coloration is obtained.
Reason : Sulphur is also present along with nitrogen in the organic compound.

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Test Inference

$a$. Dil. $HCl$ Insoluble

$b$. $NaOH$ solution Soluble

$c$. $Br_2/\text{water}$ Decolourization

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Assertion : During the test for nitrogen with Lassaigne's extract,on adding $FeCl_3$ solution,sometimes a blood-red coloration is obtained.Reason : Sulphur is also present along with nitrogen in the organic compound.