The Lassaigne's extract is boiled with dil. HNO3 before testing for halogens because

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Silver halides are soluble in HNO3

Na2S and NaCN are decomposed by HNO3

Ag2S is soluble in HNO3

AgCN is soluble is HNO3

answer is B.

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Detailed Solution

The extract is boiled with conc. HNO3 to expel N and S, through the decomposition of NaCN and Na2S takes place.

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