1.

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

Answer»

`Hg_(2)^(2+)` SALT
`CU^(2+)` salt
`AG^(+)` salt
`Pb^(2+)` salt

Solution :`Pb^(+2)+2HCl to underset("White ppt. dissolves on boiling")(PbCl_(2))darr OVERSET(H_(2)S)to underset("Black ppt.")(PbS)darr`


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