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In the Lassaigne's test for the detection of nitrogen in an onganic compound. the appearance of blue coloured compound is due to
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ferric ferrocyanide
To a part of sodium extract, FeSO $_{4}$ solution is added and the contents are warmed. A few drops of $\mathrm{FeCl}_{3}$ solution are then added and resulting $\begin{array}{lllll}\text { solution } & \text { is } & \text { acidified } & \text { with } & \text { conc. } & \text { HCl. } & \text { The }\end{array}$ appearance of bluish green or Prussian blue colouration confirms the presence of nitrogen. The reactions that occur during this test are as
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