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During detection of nitrogen in Lassaigne's test, instead of deep blue colouration, sometimes a blood red colouration is observed. Which of the following statements is/are true?
  • a)
    Nitrogen is not present in the sample.
  • b)
    Sulphur is not present in the sample.
  • c)
    Both nitrogen and sulphur are not present in the sample.
  • d)
    Both nitrogen and sulphur are present in the sample.
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
During detection of nitrogen in Lassaigne's test, instead of deep blu...
Inadequate use of sodium produces sodium thiocyanate if both sulphur and nitrogen are present.
Na + C + S + N → NaCNS
This gives blood red colouration with Fe3+ ion due to the formation of ferric thiocyanate.
Fe3+ + 6 CNS- → [Fe(CNS)6]3-
(1) This is wrong as nitrogen must be present to form CNS- ion which gives blood red colouration with Fe3+.
(2) This is also wrong as sulphur must be present to give CNS- ion.
(3) This is wrong as both N and S must be present to give CNS- ion.
(4) This is true as both must be present.
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During detection of nitrogen in Lassaigne's test, instead of deep blue colouration, sometimes a blood red colouration is observed. Which of the following statements is/are true?a)Nitrogen is not present in the sample.b)Sulphur is not present in the sample.c)Both nitrogen and sulphur are not present in the sample.d)Both nitrogen and sulphur are present in the sample.Correct answer is option 'D'. Can you explain this answer?
Question Description
During detection of nitrogen in Lassaigne's test, instead of deep blue colouration, sometimes a blood red colouration is observed. Which of the following statements is/are true?a)Nitrogen is not present in the sample.b)Sulphur is not present in the sample.c)Both nitrogen and sulphur are not present in the sample.d)Both nitrogen and sulphur are present in the sample.Correct answer is option 'D'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about During detection of nitrogen in Lassaigne's test, instead of deep blue colouration, sometimes a blood red colouration is observed. Which of the following statements is/are true?a)Nitrogen is not present in the sample.b)Sulphur is not present in the sample.c)Both nitrogen and sulphur are not present in the sample.d)Both nitrogen and sulphur are present in the sample.Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for During detection of nitrogen in Lassaigne's test, instead of deep blue colouration, sometimes a blood red colouration is observed. Which of the following statements is/are true?a)Nitrogen is not present in the sample.b)Sulphur is not present in the sample.c)Both nitrogen and sulphur are not present in the sample.d)Both nitrogen and sulphur are present in the sample.Correct answer is option 'D'. Can you explain this answer?.
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