p-Amino-N,N-dimethylaniline is added to a strongly acidic solution of X. the resulting solution is treated with a 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 intense 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 colouration 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 a 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 intense 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 colouration due to the formation of Z. The compound Y is:
Answer» `MgCI_(2)` `FeCI_(2)` `FeCI_(3)` `ZnCI_(2)` Solution :`X rarr Na_(2)S, Y rarr FeCI_(3), Z rarr Fe[Fe(CN)_(6)]`