In the Lassaigne’s test, the blood red colouration is due to the formation of 

In Lassaigne's test for N, the blue colour is due to the formation of :

In Lassaigne's test for nitrogen,the blue colour is due to the formation of

In Lassaigne's test for nitrogen the blue colour is due to the formation of

In Lassaigne's test for nitrogen the blue colur is due to the formation of

Nitrogen detection in an organic compound is carried out by Lassaigne's test. The blue colour formed is due to the formation of .............. .