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The Lassaigne’s extract is boiled with conc.HNO3 while testing for halogens. By doing so it [2011]
- a)decomposes Na2S and NaCN, if formed.
- b)helps in the precipitation of AgCl.
- c)increases the solubility product of AgCl.
- d)increases the concentration of NO3– ions
Correct answer is option 'A'. Can you explain this answer?
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The Lassaigne’s extract is boiled with conc.HNO3 while testing f...
Conc. HNO3 decomposes NaCN and Na2S to avoid their interference.
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The Lassaigne’s extract is boiled with conc.HNO3 while testing f...
The Lassaigne test, also known as the Lassaigne's test or the sodium fusion test, is a chemical test used to detect the presence of nitrogen, sulfur, or halogens in an organic compound. It was developed by French chemist Jean-Baptiste André Lassaigne in the 19th century.
The test involves the fusion of a small amount of the organic compound with sodium metal in a tube. The resulting mixture is then dissolved in water and subjected to a series of chemical reactions to detect the presence of the desired elements.
For nitrogen detection, the Lassaigne test involves the conversion of nitrogen compounds into sodium cyanide. This is achieved by treating the fused mixture with sodium hydroxide and then adding iron(II) sulfate. The presence of nitrogen is indicated by the formation of a Prussian blue precipitate.
For sulfur detection, the Lassaigne test involves the conversion of sulfur compounds into sodium sulfide. This is achieved by treating the fused mixture with sodium hydroxide and then adding lead(II) acetate. The presence of sulfur is indicated by the formation of a black precipitate of lead sulfide.
For halogen detection, the Lassaigne test involves the conversion of halogen compounds into sodium halides. This is achieved by treating the fused mixture with sodium hydroxide and then adding silver nitrate. The presence of halogens is indicated by the formation of a colored precipitate, such as silver chloride (white), silver bromide (cream), or silver iodide (yellow).
The Lassaigne test is useful in identifying the presence of these elements in organic compounds, which can be important for determining the structure, properties, and potential reactions of the compound. However, it should be noted that the test is not specific to individual compounds and can only provide a general indication of the presence of these elements.
The test involves the fusion of a small amount of the organic compound with sodium metal in a tube. The resulting mixture is then dissolved in water and subjected to a series of chemical reactions to detect the presence of the desired elements.
For nitrogen detection, the Lassaigne test involves the conversion of nitrogen compounds into sodium cyanide. This is achieved by treating the fused mixture with sodium hydroxide and then adding iron(II) sulfate. The presence of nitrogen is indicated by the formation of a Prussian blue precipitate.
For sulfur detection, the Lassaigne test involves the conversion of sulfur compounds into sodium sulfide. This is achieved by treating the fused mixture with sodium hydroxide and then adding lead(II) acetate. The presence of sulfur is indicated by the formation of a black precipitate of lead sulfide.
For halogen detection, the Lassaigne test involves the conversion of halogen compounds into sodium halides. This is achieved by treating the fused mixture with sodium hydroxide and then adding silver nitrate. The presence of halogens is indicated by the formation of a colored precipitate, such as silver chloride (white), silver bromide (cream), or silver iodide (yellow).
The Lassaigne test is useful in identifying the presence of these elements in organic compounds, which can be important for determining the structure, properties, and potential reactions of the compound. However, it should be noted that the test is not specific to individual compounds and can only provide a general indication of the presence of these elements.
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The Lassaigne’s extract is boiled with conc.HNO3 while testing for halogens. By doing so it [2011]a)decomposes Na2S and NaCN, if formed.b)helps in the precipitation of AgCl.c)increases the solubility product of AgCl.d)increases the concentration of NO3– ionsCorrect answer is option 'A'. Can you explain this answer?
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The Lassaigne’s extract is boiled with conc.HNO3 while testing for halogens. By doing so it [2011]a)decomposes Na2S and NaCN, if formed.b)helps in the precipitation of AgCl.c)increases the solubility product of AgCl.d)increases the concentration of NO3– ionsCorrect answer is option 'A'. Can you explain this answer? for Class 11 2024 is part of Class 11 preparation. The Question and answers have been prepared according to the Class 11 exam syllabus. Information about The Lassaigne’s extract is boiled with conc.HNO3 while testing for halogens. By doing so it [2011]a)decomposes Na2S and NaCN, if formed.b)helps in the precipitation of AgCl.c)increases the solubility product of AgCl.d)increases the concentration of NO3– ionsCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 11 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The Lassaigne’s extract is boiled with conc.HNO3 while testing for halogens. By doing so it [2011]a)decomposes Na2S and NaCN, if formed.b)helps in the precipitation of AgCl.c)increases the solubility product of AgCl.d)increases the concentration of NO3– ionsCorrect answer is option 'A'. Can you explain this answer?.
The Lassaigne’s extract is boiled with conc.HNO3 while testing for halogens. By doing so it [2011]a)decomposes Na2S and NaCN, if formed.b)helps in the precipitation of AgCl.c)increases the solubility product of AgCl.d)increases the concentration of NO3– ionsCorrect answer is option 'A'. Can you explain this answer? for Class 11 2024 is part of Class 11 preparation. The Question and answers have been prepared according to the Class 11 exam syllabus. Information about The Lassaigne’s extract is boiled with conc.HNO3 while testing for halogens. By doing so it [2011]a)decomposes Na2S and NaCN, if formed.b)helps in the precipitation of AgCl.c)increases the solubility product of AgCl.d)increases the concentration of NO3– ionsCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 11 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The Lassaigne’s extract is boiled with conc.HNO3 while testing for halogens. By doing so it [2011]a)decomposes Na2S and NaCN, if formed.b)helps in the precipitation of AgCl.c)increases the solubility product of AgCl.d)increases the concentration of NO3– ionsCorrect answer is option 'A'. Can you explain this answer?.
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The Lassaigne’s extract is boiled with conc.HNO3 while testing for halogens. By doing so it [2011]a)decomposes Na2S and NaCN, if formed.b)helps in the precipitation of AgCl.c)increases the solubility product of AgCl.d)increases the concentration of NO3– ionsCorrect answer is option 'A'. Can you explain this answer?, a detailed solution for The Lassaigne’s extract is boiled with conc.HNO3 while testing for halogens. By doing so it [2011]a)decomposes Na2S and NaCN, if formed.b)helps in the precipitation of AgCl.c)increases the solubility product of AgCl.d)increases the concentration of NO3– ionsCorrect answer is option 'A'. Can you explain this answer? has been provided alongside types of The Lassaigne’s extract is boiled with conc.HNO3 while testing for halogens. By doing so it [2011]a)decomposes Na2S and NaCN, if formed.b)helps in the precipitation of AgCl.c)increases the solubility product of AgCl.d)increases the concentration of NO3– ionsCorrect answer is option 'A'. Can you explain this answer? theory, EduRev gives you an
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