An aqueous solution of a substance 'X' gives a white ppt. on treatment – InterviewSolution

1.	An aqueous solution of a substance 'X' gives a white ppt. on treatment with dil. HCI, which dissolves on heating. When hydrogen sulphide is passed through the hot acidic solution, a black ppt. is obtained. 'X' is:
Answer» `Cu^(2+)` salt `Hg_2^(2+)` salt `Pb^(2+)` salt `AG^(+)` salt . ANSWER :C

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