Question

Three separate samples of a solution of a single salt gave these results. One formed a white precipitate with excess ammonia solution, one formed a white precipitate with dil. HCl solution and one formed a black precipitate with H₂S. The salt could be

• A. AgNO₃
• B. Pb(NO₃)₂
• C. Hg(NO₃)₂
• D. MnSO₄

Hint:

Lead salts show characteristic reactions with HCl, NH₃ and H₂S.

Answer 1

The Correct Option is B

Step 1: Pb²⁺ gives white PbCl₂ with HCl.
Step 2: Gives white precipitate with NH₃.
Step 3: Gives black PbS with H₂S.