Salt A is a strong oxidizing agent that turns the flame into purple. When heated A decomposes with the formation of salts B and C. During thermal decomposition of A in the presence of a catalyst salt C and gas G (a simple substance) are formed. During the electrolysis of a melt or solution of salt C, gas D is released at the anode. When D reacts with hot alkali E, the initial salt A can be obtained. It is known that the difference between the molecular masses of salts B and C is 64.