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In Lassaigne’s test a violet colour obtained indicates the presence of
Options
(a) nitrogen
(b) sulphur
(c) halogen
(d) none of the above
Correct Answer:
sulphur
Explanation:
S + 2Na → Na₂S. Na₂S + Na₂[Fe(NO)(CN)₅] (Sodium nitroprusside) → Na₄[Fe(CN)₅NOS] (violet or purple colour).
Related Questions: - Which of the following forms cationic micelles above certain concentration
- Which of the following will not show resonance
- When KMnO₄ reacts with KBr in alkaline medium gives bromate ion. Then oxidation
- 5 mL of N HCl, 20 mL of N/2 H₂SO₄ and 30 mL of N/3 HNO₃ are mixed together
- Which does not exist
Topics: Basic Principles of Organic Chemistry
(124)
Subject: Chemistry
(2512)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Which of the following forms cationic micelles above certain concentration
- Which of the following will not show resonance
- When KMnO₄ reacts with KBr in alkaline medium gives bromate ion. Then oxidation
- 5 mL of N HCl, 20 mL of N/2 H₂SO₄ and 30 mL of N/3 HNO₃ are mixed together
- Which does not exist
Topics: Basic Principles of Organic Chemistry (124)
Subject: Chemistry (2512)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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