In the Lassaigne's test for nitrogen in ...

In the Lassaigne's test for nitrogen in an organic compound, the Pressian blue colour is obtained due to the formation of :

`Na_(4)[Fe(CN)_(6)]`

`Fe_(4)[Fe(CN)_(6)]_(3)`

`Fe_(2)[Fe(CN)_(6)]`

`Fe_(3)[Fe(CN)_(6)]_(4)`.

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