Question

An aqueous solution of a substance gives a white precipitate on treatment with dil. HCl which dissolves on heating. When H₂S is passed through the hot acidic solution, a black precipitate is obtained. The substance is a:

• A. Hg²⁺ salt
• B. Cu²⁺ salt
• C. Ag^+ salt
• D. Pb²⁺ salt

Hint:

PbCl₂ dissolves in hot water.

Answer 1

The Correct Option is D

- Dil. HCl gives white PbCl₂ precipitate - PbCl₂ dissolves on heating - Passing H₂S gives black PbS precipitate These are characteristic tests for Pb²⁺.