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

Options

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

Answer

C, D

Explanation

Precipitate is formed on pasing `H_(2)S` in acidic medium i.e., ion must be of group II
`Cu^(2+),Pb^(2+),Hg^(2+),Bi^(3+)`