Question

In the following sequence in aqueous solution, the species X, Y and Z, respectively, are
`S_(2)O_(3)^(2-) overset(Ag^(+))rarrunderset(("Clear solution"))X overset (Ag^(+))rarr underset(("White ppt."))Y overset("With time")rarr underset(("Black ppt."))Z`
A. `[Ag(S_(2)O_(3))_(2)]^(3-),Ag_(2)S_(2)O_(3),Ag_(2)S`
B. `[Ag(S_(2)O_(3))_(3)]^(5-),Ag_(2)SO_(3),Ag_(2)S`
C. `[Ag(SO_(3))_(2)]^(3-),Ag_(2)S_(2)O_(3),Ag`
D. `[Ag(SO_(3))_(3)]^(3-),Ag_(2)SO_(4),Ag`.

Answer 1

Correct Answer - A
(a) `Ag^(+)+S_(2)O_(3)^(2-)rarrunderset(darrAg^(+))underset("Clear solution (X)")([Ag(S_(2)O_(3))_(2)]^(3-))`
`underset("Black ppt. (Z)")underset()(Ag_(2)S)overset("CaO")larrunderset("White ppt. (Y)")underset()(Ag_(2)S_(2)O_(3))`