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Question: Answered & Verified by Expert
In Lassaigne's test for nitrogen in an organic compound, the blue colouration is due to the formation of
ChemistryGeneral Organic ChemistryCOMEDKCOMEDK 2012
Options:
  • A ferro-ferriccyanide
  • B ferric-ferrocyanide
  • C potassium ferrocyanide
  • D potassium ferrocyanide
Solution:
1407 Upvotes Verified Answer
The correct answer is: ferric-ferrocyanide
The blue colouration is due to formation of ferric ferrocyanide, $\mathrm{Fe}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]_{3}$ in Lassaigne's test for nitrogen.

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