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Sodium extract is heated with conc. HNO3 before testing for halogens because

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Sodium extract is heated with conc. HNO3 before testing for halogens because

(a) silver halides are insoluble in water

(b) Na2S and NaCN are decomposed by conc. HNO3

(c) Ag2S is soluble in HNO3

(d) AgCN is soluble in HNO3.

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Correct option is (b) Na2S and NaCN are decomposed by conc. HNO3

During fusion with sodium, NaCN, Na2S and NaX are formed depending upon the nature of the element in the compound. The former two are destroyed by conc. HNO3 for getting good results for testing the presence of halogens.

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