Identify the cationic and anionic radical in given unknown salt A by performing dry and wet test for cationic radical and anionic radical

Dry Heating Test

This test is performed by heating a small amount of salt in a dry test tube. Quite valuable information can be gathered by carefully performing and noting the observations. On heating, some salts undergo decomposition, thus evolving the gases.
Identification of Anions (Acid Radicals)
The identification of the radicals is first done on the basis of the preliminary tests. The Dry heating test is one of the preliminary tests performed earlier which may give some important information about the acid radical present