An aqueous solutio of a salt (A) gives white precipitate with NaCl solution and filtrate of this with `H_(2)S` gives black preci

An aqueous solutio of a salt (A) gives white precipitate with NaCl solution and filtrate of this with `H_(2)S` gives black precipitate . Then which one of the following cations should be present in
A. `Hg^(+)`
B. `Cu^(+)`
C. `Cu^(++)`
D. `Pb^(++)`

An aqueous solutio of a salt (A) gives white precipitate with NaCl solution and filtrate of this with `H_(2)S` gives black precipitate . Then which on

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