The aqueous solution of a certain compound (X), when added to a copper sulphate solution, a brown precipitate is obtained which tums white on addition of excess of Na_(2)S_(2)O_(3) solution. Its aqueous solution, when added to Ag^(+) ion solution, a yellow curdy precipitate is obtained which is insoluble in ammonium hydroxide. Hence, compound (X) is

The aqueous solution of a certain compound (X), when added to a copper

1.	The aqueous solution of a certain compound (X), when added to a copper sulphate solution, a brown precipitate is obtained which tums white on addition of excess of Na_(2)S_(2)O_(3) solution. Its aqueous solution, when added to Ag^(+) ion solution, a yellow curdy precipitate is obtained which is insoluble in ammonium hydroxide. Hence, compound (X) is
Answer» NaBr KBr Kl `PbCrO_(4)` Solution :(X) is Kl `l^(-)+AG^(+)UNDERSET("Yellow ppt.")(toAgl)` `CuSO_(4)+underset((X))(2Kl)to"Cul"_(2)+K_(2)SO_(4)` `"2Cul"_(2)underset("Brown ppt.")(toCu_(2)l_(2))darr+l_(2)` `Na_(2)S_(2)O_(3)+l_(2)toNa_(2)S_(4)O_(6)+2Nal` Hence,(C) is the correct answer.