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(C) Sodium extract is heated with conc. $HNO_3$ to convert any $NaCN$ formed during fusion into $HCN$ and sulphide into $H_2S$. This is done when the

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$S^{2-}$ and $CN^{-}$ ions,if present,are decomposed by conc. $HNO_3$ and hence do not interfere in the test

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(C) Sodium extract is heated with conc. $HNO_3$ to convert any $NaCN$ formed during fusion into $HCN$ and sulphide into $H_2S$. This is done when the compound contains $N$ or $S$ along with halogens. $HCN$ and $H_2S$ formed escape as they are volatile. Otherwise,they interfere with the test for halogens as they also form a precipitate with $AgNO_3$. $NaCN + HNO_3 \rightarrow NaNO_3 + HCN \uparrow$ $Na_2S + 2HNO_3 \rightarrow 2NaNO_3 + H_2S \uparrow$

Sodium extract is heated with concentrated $HNO_3$ before testing for halogens because

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