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

ferro ferricyanide

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ferric ferrocyanide

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ferric cyanide

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ferrocyanide

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Solution

The correct option is B ferric ferrocyanide
In Lassigne's test for Nitrogen in an organic compound, the Prussian blue colouration is due to the formation of Ferric ferrocyanide $F e_{4} [F e (C N)_{6}]_{3}$ .
Note: The sodium fusion extract is boiled with ferrous sulphate and then acidified with concentrated sulphuric acid.

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