An aqueous solution of a substance gives a white precipitate on treatment with dilute hydrochloric acid, which dissolves on heating. When hydrogen sulphide is passed through the hot acidic solution, a black precipitate is obtained. The substance is a

Options

A. `Hg^(2+)` salt
B. `Cu^(2+)` salt
C. `Ag^(+)` salt
D. `Pb^(2+)` salt

Answer

D