An organic compound $A$ is oxidized with $Na_2O_2$ followed by boiling with $HNO_3$. The resultant solution is then treated with ammonium molybdate to yield a yellow precipitate. Based on the above observation,the element present in the given compound is:

Given below are two statements:
Statement $I$ : Sulphanilic acid gives esterification test for carboxyl group.
Statement $II$ : Sulphanilic acid gives red colour in Lassaigne's test for extra element detection.
In the light of the above statements,choose the most appropriate answer from the options given below :

The violet color obtained in the Lassaigne's test for a sulfur-containing compound is due to the formation of which species?

Lassaigne's test is not used for the detection of which element?

During the detection of phosphorus in an organic compound,which of the following is formed to produce a yellow color?

The Lassaigne test is used for the detection of which of the following elements?