Which among the following is incorrect statement?

One of the commonly used electrode is calomel electrode. Under which of the following categories, calomel electrode comes?

The correct order of first ionization enthalpy values of the following elements is :

(A) O

(B) N

(C) Be

(D) F

(E) B

Choose the correct answer from the options given below :

Which of the following nitrogen containing compound does not give Lassaigne's test ?