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Question - Give lassaigne's test for detection of halogens, give role of nitric acid in the.
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• Lassagine's test
Nitrogenn, Sulphur, and halogens present in organic compounds are detected by Lassaigne’s test.
role of nitric acid
HNO3 is added in Lassagine's test for the removal of ions ( cynaides , carbonates , sulphides ) .
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Sodium extract (or Lassaigne's extract) is boiled with dilute nitric acid to decompose sodium cyanide or sodium sulphide (if present) to hydrogen cyanide and hydrogen sulphide gases, respectively. This solution is cooled and silver nitrate solution added.
A white precipitate soluble in ammonia shows 'chlorine', a yellowish precipitate sparingly soluble in ammonia indicates 'bromine', and an yellow precipitate insoluble in ammonia shows the presence of 'iodine' in the given organic compound.
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