A certain compound (A) is used in the laboratory for analysis, its aqueous solution gives the following reactions: a. On addition to copper sulphate, a brown precipitate is obtained which turns white on addition of excess of the `Na_(2)S_(2)O_(3)` solution. b. On addition to the `Ag^(o+)` ion solution, a yellow curdy precipitate is obtained which is insoluble in ammonium hydroxide. Identify (A) and give equations for the reactions at steps (a) and (b).

A certain compound (A) is used in the laboratory for analysis, its aqu

1.	A certain compound (A) is used in the laboratory for analysis, its aqueous solution gives the following reactions: a. On addition to copper sulphate, a brown precipitate is obtained which turns white on addition of excess of the `Na_(2)S_(2)O_(3)` solution. b. On addition to the `Ag^(o+)` ion solution, a yellow curdy precipitate is obtained which is insoluble in ammonium hydroxide. Identify (A) and give equations for the reactions at steps (a) and (b).
Answer» Yellow curdy ppt. with `Ag^(+)` confirms the presence of `l^(-)` ion in the compound. The precipitate is insoluble in `NH_(4)OH.` `[Ah^(+)+l^(-)] rarrAgl].` The compound (X) gives brown ppt. with `CuSO_(4)` which becomes white when `Na_(2)S_(2)O_(3)` is added. Thus compound X should be Kl. The reactions : `CuSO_(4)+2Kl rarr Cul_(2)+K_(2)SO_(4)` `2Cul_(2) rarr underset("Brown")(Cu_(2)l_(2))+l_(2)` `2Na_(2)S_(2)O_(3)+l_(2) rarr underset("thionate (white)")underset("Sodium tetra")(Na_(2)S_(4)O_(6))+2Nal`

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