which among the following pairs of ions cannot be separated by H_(2)S in the presence of dilute HCl ?

which among the following pairs of ions cannot be separated by H_(2)S

1.	which among the following pairs of ions cannot be separated by H_(2)S in the presence of dilute HCl ?
Answer» `Bi^(3+) , Sn^(4+)` `AL^(3+), Hg^(2+)` `Zn^(2+), Cu^(2+)` `Ni^(2+), Cu^(2+)` Solution :`Br^(3+)` and `Sn^(4+)` ions belong to the same group (group II). They cannot be separated by passing `H_(2)S` through the mixture solution in the presence of dilute HCl