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+)`
`Ag^(+)` salt
`PB^(2+)` salt

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