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The Lassaigne's extract is boiled with conc. HNO3 while testing for halogens. By
doing so it.
  • a)
    Increase the concentration of ions
  • b)
    Decomposes Na2S and NaCN, if formed
  • c)
    Helps in the precipitation of AgCl
  • d)
    Increases the solubility product of AgCl
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
The Lassaignes extract is boiled with conc. HNO3 while testing for hal...
NaCN+HNO3(aq)​⟶NaNO3(aq)​+HCN(g)​↑

Na2​S(aq)​+2HNO3(aq)​⟶2NaNO3(aq)​+H2​S(g)​↑

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.Hence option B is correct
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The Lassaignes extract is boiled with conc. HNO3 while testing for halogens. Bydoing so it.a)Increase the concentration of ionsb)Decomposes Na2S and NaCN, if formedc)Helps in the precipitation of AgCld)Increases the solubility product of AgClCorrect answer is option 'B'. Can you explain this answer?
Question Description
The Lassaignes extract is boiled with conc. HNO3 while testing for halogens. Bydoing so it.a)Increase the concentration of ionsb)Decomposes Na2S and NaCN, if formedc)Helps in the precipitation of AgCld)Increases the solubility product of AgClCorrect answer is option 'B'. Can you explain this answer? for NEET 2025 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about The Lassaignes extract is boiled with conc. HNO3 while testing for halogens. Bydoing so it.a)Increase the concentration of ionsb)Decomposes Na2S and NaCN, if formedc)Helps in the precipitation of AgCld)Increases the solubility product of AgClCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for NEET 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The Lassaignes extract is boiled with conc. HNO3 while testing for halogens. Bydoing so it.a)Increase the concentration of ionsb)Decomposes Na2S and NaCN, if formedc)Helps in the precipitation of AgCld)Increases the solubility product of AgClCorrect answer is option 'B'. Can you explain this answer?.
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