Q 2600445318.     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

JEE 2002
A

`Hg_2^(2+)` salt

B

`Cu^(2+)` salt

C

`Ag^(+)` salt

D

`Pb^(2+)` salt

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