Which of the following pairs of cations can be separated by passing `H_(2)S` through the mixture in the presence of 0.2 M HCl?

Options

A. `Pb^(2+),Cu^(2+)`
B. `Ag^(+),Cu^(2+)`
C. `Cd^(2+),Bi^(3+)`
D. `Cu^(2+),Zn^(2+)`

Answer

D