Why is it necessary to fuse the compound with sodium in the detection of N, S or halogens by Lassaigne's test?

Can we detect oxygen in a compound by Lassaigne's test ?

Write the chemical equation involved in the detection of nitrogen by Lassaigne's test.

Why is it necessary to prepare original solution for the detection of basic radicals?

Qualitative analysis of organic compounds is performed by Lassaigne's test by fusion with metallic sodium, by which the covalent compounds are converted into ionic compounds. Extra elements like N,S,P and halogens are detected by their usual tests. Q. Prussian blue colour in the detection of nitrogen in lassaigne's test in due to the formation of:

The element which cannot be detected by Lassaigne's test is

Which element cannot be detected by Lassaigne's test?

F cannot be tested by "Lassaigne’s test" because

In which of the following compounds, nitrogen cannot be tested by Lassaigne's test?

The compound that does not give a blue color in Lassaigne's test is

Why is it necessary to use acetic acid and not suplhuric acid for the acidification of sodium extract for testing suplhur by lead acetate test?