During Lassaigne's test, the elements present in an organic...

In Lassaigne's test, an organic compound is fused with sodium metal. The elements present in the organic compound, such as nitrogen, sulphur, and halogens, are initially present in covalent form.

During the fusion process, these elements react with sodium to form ionic sodium salts. For example, nitrogen and carbon form sodium cyanide ($\text{NaCN}$), sulphur forms sodium sulphide ($\text{Na}_2\text{S}$), and halogens form sodium halides ($\text{NaX}$).

Therefore, the elements are converted from covalent form to ionic form.

Answer: covalent form to ionic form