In Lassaigne's test for the detection of halo | vedclass

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(B) If the organic compound contains nitrogen or sulphur,the Lassaigne's extract is boiled with $HNO_3$ to decompose sodium cyanide $(NaCN)$ or sodium

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to decompose $Na_2S$ and $NaCN$,if present

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(B) If the organic compound contains nitrogen or sulphur,the Lassaigne's extract is boiled with $HNO_3$ to decompose sodium cyanide $(NaCN)$ or sodium sulphide $(Na_2S)$ formed during fusion.$NaCN + HNO_3 ightarrow NaNO_3 + HCN \uparrow $$Na_2S + 2HNO_3 ightarrow 2NaNO_3 + H_2S \uparrow $If cyanide and sulphide ions are not removed,they react with silver nitrate $(AgNO_3)$ and interfere with the halogen test by forming precipitates:$NaCN + AgNO_3 ightarrow AgCN 	ext{ (White ppt.)} + NaNO_3$$Na_2S + 2AgNO_3 ightarrow Ag_2S 	ext{ (Black ppt.)} + 2NaNO_3$

In Lassaigne's test for the detection of halogens,the sodium fusion extract is first boiled with concentrated nitric acid. This is

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