An queous solution of a substance gives a white precipitate on treating with dilute hydrochloric acid which dissolves on heating. When hydrogen sulphide is passed through the hot solution, a black precipitate is obtained. The substance is :A. `Hg^(2+)` saltB. `Cr^(3+)` saltC. `Ag^(+)` saltD. `Pb^(2+)` salt

An queous solution of a substance gives a white precipitate on treatin

1.	An queous solution of a substance gives a white precipitate on treating with dilute hydrochloric acid which dissolves on heating. When hydrogen sulphide is passed through the hot solution, a black precipitate is obtained. The substance is :A. `Hg^(2+)` saltB. `Cr^(3+)` saltC. `Ag^(+)` saltD. `Pb^(2+)` salt
Answer» Correct Answer - A `Hg^(2+)` salt gives white precipitate with dilute HCl. `HgO + 2HCl rarr underset(("White ppt"))(HgCl_(2)) + H_(2)O` `HgCl_(2) + H_(2)S rarr underset(("Black ppt"))(HgS) + 2HCl`

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