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The Prussian blue colour obtained during the test of nitrogen by Lassaigne’s test is due to the formation of
  • a)
    Fe4[Fe(CN)6]3
  • b)
    Na3[Fe(CN)6]
  • c)
    Fe(CN)3
  • d)
    Na4[Fe(CN)5NOS]
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
The Prussian blue colour obtained during the test of nitrogen by Lassa...
In Lassaigne’s test for nitrogen, the organic compound is fused with sodium to form sodium cyanide (NaCN) if nitrogen is present. During the test, the sodium fusion extract is treated with ferrous sulfate (FeSO4) and ferric chloride (FeCl3), followed by acidification. This leads to the formation of a complex compound, ferric ferrocyanide, which has the formula Fe4[Fe(CN)6]3 and gives the characteristic Prussian blue color.
  • B is incorrect as it does not represent the Prussian blue complex.
  • C is not a stable compound.
  • D is related to the test for sulfur and nitrogen together, not just nitrogen.
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