Which compound is formed as a violet-colored complex during the test for sulfur?

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

Discuss the chemistry of Lassaigne's test.

An organic compound containing phosphorus on oxidation with $Na_2O_2$ gives a compound '$X$'. This '$X$' when boiled with $HNO_3$ followed by treatment with ammonium molybdate reagent gives a yellow precipitate '$Y$'. '$X$' and '$Y$' respectively are:

During the fusion of an organic compound with sodium metal,the nitrogen present in the organic compound is converted into:

If $N$ and $S$ are present in an organic compound during the Lassaigne test,then both change into: