1.

An aqueous solution of a substance gives a white precipitate on treatment with dilute HCI, 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+) `
`Cu^(2+)` SALT
`Ag^(+)` salt
`Pb^(2+)` salt.

Solution :`PbCl_2` is solublein hot water but insolublein COLD water
`Pb^(2+) + 2HCl to underset("WHITE ppt")(PbCl_2 darr) overset(H_2S)to underset("Black ppt")(PbS) `


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