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An aqueous solution of a substance gives...

An aqueous solution of a substance gives a white percipitate on treatment with dil `HCl`, which dissole on heating. On passing `H_(2)S` in hot acidic solution a black percipitate is formed. The substance is:

A

`Hg_(2)^(2+)` salt

B

`Cu^(2+)` salt

C

`Ag^(+)` salt

D

`Pb^(2+)` salt

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