1.

How many of the following pairs of ions can be separated by H_(2)S in dilute HCl? Bi^(3+) and Sn^(4+),Al^(3+) and Hg^(2+),Cd^(2+) and Zn^(2+),Fe^(3+) and Cu^(2+),As^(3+) and Sb^(3+)

Answer»


Solution :(1)`Al^(3+)` and `Hg^(2+) underset(H_(2)S) OVERSET(H^(+)) to HgS DARR ("black")+ Al^(3+)` (in solution)
(2)`Cd^(2+)` and `Zn^(2+) underset(H_(2)S) overset(H^(+)) to CdS darr ("yellow")+ Zn^(2+)` (in solution)
(3)`FE^(3+)` and `Cu^(2+) underset(H_(2)S) overset(H^(+)) to CuS darr ("black")+ Fe^(3+)` (in solution)


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