Three separate samples of a solution of a single salt gave these results. One formed a white precipi — Qualitative and Quantitative Analysis Chemistry Question
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. NaCl solution and one formed a black precipitate with H2S. The salt could be:
Answer: B
💡 Solution & Explanation
Pb(NO3)2 + 2NH4OH -> Pb(OH)2(white ppt.) + 2NH4NO3. Pb(NO3)2 + 2NaCl -> PbCl2(white ppt.) + 2NaNO3. Pb(NO3)2 + H2S -> PbS(black ppt.) + 2HNO3
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