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Q.

Lassaigne`s solution is boiled with conc. HNO3  before testing for halogens because

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a

Ag2S is soluble in HNO3

b

Silver halides are insoluble in HNO3

c

AgCN is soluble in HNO3

d

Na2S and NaCN are decomposed by HNO3

answer is B.

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Detailed Solution

If sulphur or nitrogen is present in the compound, the sodium fusion extract is first boiled with concentrated nitric acid to decompose cyanide or sulphide of sodium formed during Lassaigne’s test.  otherwise these ions will interfere with silver nitrate test and result in other color formation.

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