Question

Which one among the following pairs of ions cannot be separated by `H_2 S` in dilute hydrochloric acid?
A. `Bi^(3+),Sn^(4+)`
B. `Al^(3+),Hg^(2+)`
C. `Zn^(2+),Cu^(2+)`
D. `Ni^(2+),Cu^(2+)`

Answer 1

Both `Bi^(3+)` and `Sn^(4+)` are precipitated as sulphide in the presence of dil. HCl