In the Lassaigne's test for the detection of nitrogen in an organic compound, the appearance of blue coloured compound is due to

Options

A. Ferric ferricyanide
B. Ferrous ferricyanide
C. Ferric ferrocyanide
D. Ferrous ferrocyanide

Answer

C

Explanation

`6CN^(-) + Fe^(2+) to [Fe(CN)_(6)]_(4)^(-)`
`3[Fe(CN)_(6)]_(4)^(-) + 4Fe^(3+) + xH_(2)O to underset("prussian blue colour")(Fe_(4)[Fe(CN)_(6)].xH_(2)O)`