Which of the following substances gives a red color when its $Lassaigne's$ extract is treated with alkali and ferric chloride?

Sodium extract is heated with concentrated $HNO_3$ before testing for halogens because

Given below are two statements :
Statement $I :$ In Lassaigne's test,the covalent organic molecules are transformed into ionic compounds.
Statement $II :$ The sodium fusion extract of an organic compound having $N$ and $S$ gives prussian blue colour with $FeSO_4$ and $FeCl_3$.
In the light of the above statements,choose the correct answer from the options given below.

Discuss the chemistry of Lassaigne's test.

What happens to the halogen when $AgNO_3$ is added to the Lassaigne solution acidified with $HNO_3$?

Match Column $-I$ with Column $-II$.

Column $-I$	Column $-II$
$(A).$ Dumas method	$(3).$ Nitrogen gas
$(B).$ Kjeldahl's method	$(5).$ Ammonium sulphate
$(C).$ Carius method	$(1).$ $AgNO_3$
$(D).$ Chromatography	$(2).$ Silica gel
$(E).$ Homolytic fission	$(4).$ Free radical