1.

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

Answer»

`Hg_(2)^(2+)` salt
`Cu^(2+)` salt
`AG^(+)` salt
`Pb^(2+)` salt

Solution :`Pb^(+2)+"2HCl"tounderset("White PPT. dissolving on boiling")(PbCl_(2)darr)OVERSET(H_(2)S)tounderset("Black ppt.")(PbSdarr)`
HENCE,(D) is the correct ANSWER.


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