The pair (s) where both the ions are precipitated upon passing `H_(2)S` gas in the presence of dilute `HCl` is (are) :

Options

A. `Ba^(2+) , Zn^(2+)`
B. `Ba^(2+), Fe^(3+)`
C. `Cu^(2+) , Pb^(2+)`
D. `Hg^(2+), Bi^(3+)`

Answer

C, D

Explanation

All the ions are present in two pairs belonging to IInd group of basic radicals. They will be precipitated as their sulphides