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  4. An aqueous solution of a substance gives a white precipitate on treatment with dilute hydrochloric acid, which dissolves on heating. When hydrogen sulphide is passed through the hot acidic solution, a black precipitate is obtained. The substance is a

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Q. An aqueous solution of a substance gives a white precipitate on treatment with dilute hydrochloric acid, which dissolves on heating. When hydrogen sulphide is passed through the hot acidic solution, a black precipitate is obtained. The substance is a

IIT JEEIIT JEE 2000Organic Chemistry – Some Basic Principles and Techniques

Solution:

$PbCl_2$ is soluble in hot water and $PbS$ (black) is formed on passing $H_2 S(g)$ through acidic solution.