Compound X on strong heating in a boiling tube gives off reddish brown fumes and a yellow residue with a few drops of sodium hydroxide solution a white precipitate appeared.Identify the cation and anion present in the compound X

A white powder when strongly heated gives of brown fumes. A solution of this powder gives and yellow precipitate with a solution of KI. When a solution of barium chloride is added to the solution of powder , a white precipitate result . This white powder may be -

A white powder when strongly heated gives off brown fumes. A solution of this powder gives a yellow ppt with a solution of KI. When a solution of barium chloride is added to a solution of powder, a white ppt results. This white powder may be :

A certain compound (X) when treated with copper sulphate solution yields a brown precipitate. On adding hypo solution the precipitate turns white. The compound is

A coloured solution of a salt gives following reactions: I. It gives white precipitate with sodium hydroxide which becomes brown on exposure to air. II. It gives white precipitate with ammonia solution which is soluble in ammonium salts. III. Its acidified solution contanining a few drops of dilute AgNO_(3) on boiling with ammonium peroxodisulphate gives a reddish violet solution. The cation of the salt is: