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In Lassaigne's test for nitrogen in an organic compound, the blue colouration is due to the formation of
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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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