Question

An aqueous solution of a substance gives a white precipitate on treatment with dil HCl, which dissolved on heating. On passing $H_{2}S$ in hot acidic solution a black precipitate is formed. The substance is:

• A. Hg₂²⁺ salt
• B. Cu²⁺ salt
• C. Ag⁺ salt
• D. Pb²⁺ salt

Answer 1

The correct option is D

Pb²⁺ salt

$PbC{l}_2$ is soluble in hot water but insoluble in cold water.

$P{b}^{2+}+2HCl\stackrel{\Delta }{\to }PbC{l}_2\stackrel{H_{2}S}{\to }PbS$