p-Amino-N,N-dimethylaniline is added to a strongly acidic solution of X.The resulting solution is treated with few drops of aqueous solution of Y to yield blue colouration due to the formation of methylene blue.Treatment of the aqueous solution of Y with the reagent potassium hexacyanoferrate(II) leads to the formation of an intension blue precipitate.The precipitate dissolves on excess addition of the reagent.Similarly, treatment of the solution of Y with the solution of potassium hexacyanoferrate(III) leads to a brown coloration due to the formation of Z. The compound Y is :

p-Amino-N,N-dimethylaniline is added to a strongly acidic solution of

1.	p-Amino-N,N-dimethylaniline is added to a strongly acidic solution of X.The resulting solution is treated with few drops of aqueous solution of Y to yield blue colouration due to the formation of methylene blue.Treatment of the aqueous solution of Y with the reagent potassium hexacyanoferrate(II) leads to the formation of an intension blue precipitate.The precipitate dissolves on excess addition of the reagent.Similarly, treatment of the solution of Y with the solution of potassium hexacyanoferrate(III) leads to a brown coloration due to the formation of Z. The compound Y is :
Answer» `MgCl_(2)` `FeCl_(2)` `FeCl_(3)` `ZnCl_(2)` Solution : The COMPOUND `X` is `Na_(2)S` and `Y` is `FeCl_(3)`