Question

An aqueous solution of a substance gives a white precipitate on treatment with dilute hydrochloric acid, which dissolves on heating. When hydrogen sulfide is passed through the hot acidic solution, a black precipitate is obtained. The substance is a (a) $Hg_2^{2+}$ salt (b) Cu²⁺ salt(c) Ag⁺ salt (d) Pb²⁺ salt

Answer 1

Pb²+2HCl⇒PbCl2+H2S⇒PbS