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An aqueous solution of a substance gives a white precipitate on treatment with dil. HCl which dissolves on heating. When $\mathrm{H}_{2} \mathrm{~S}$ is passed through the hot acidic solution, a black precipitate is obtained. The substance is a
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$\mathrm{Pb}^{2+}$ salt
$\mathrm{PbCl}_{2}$ is insoluble in cold water, soluble in hot water and $\mathrm{PbS}$ is black ppt in acidic medium.
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