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An aqueous solution of a substan ce 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)Hg22+ salt
- b)Cu2+ salt
- c)Ag+ salt
- d)Pb2+ salt
Correct answer is option 'D'. Can you explain this answer?
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An aqueous solution of a substan ce gives a white precipitate on treat...
Precipitate with Dilute HCl
When an aqueous solution of a substance gives a white precipitate on treatment with dilute HCl, it indicates the presence of a metal cation that forms an insoluble chloride salt. The white precipitate is usually a chloride salt of the metal cation.
Dissolves on Heating
The fact that the white precipitate dissolves on heating suggests that the chloride salt is not very stable and decomposes upon heating. This behavior is characteristic of lead chloride (PbCl2), which decomposes into lead oxide (PbO) and hydrogen chloride (HCl) when heated.
Black Precipitate with H2S
When hydrogen sulfide (H2S) gas is passed through the hot acidic solution containing the dissolved white precipitate, a black precipitate is obtained. This black precipitate is a sulfide salt of the metal cation, indicating the presence of a metal that forms an insoluble sulfide.
Identification of the Substance
Based on the observations, the substance can be identified as a lead (Pb2+) salt.
Reasoning
- The white precipitate formed with dilute HCl that dissolves on heating suggests the presence of a lead chloride salt (PbCl2).
- The black precipitate obtained when H2S is passed through the hot acidic solution confirms the presence of a lead sulfide salt (PbS).
- Therefore, the substance in question is a lead (Pb2+) salt.
Conclusion
In conclusion, the correct answer is option 'D' - Pb2+ salt. The observations of a white precipitate with dilute HCl that dissolves on heating, followed by the formation of a black precipitate with H2S, indicate the presence of a lead (Pb2+) salt.
When an aqueous solution of a substance gives a white precipitate on treatment with dilute HCl, it indicates the presence of a metal cation that forms an insoluble chloride salt. The white precipitate is usually a chloride salt of the metal cation.
Dissolves on Heating
The fact that the white precipitate dissolves on heating suggests that the chloride salt is not very stable and decomposes upon heating. This behavior is characteristic of lead chloride (PbCl2), which decomposes into lead oxide (PbO) and hydrogen chloride (HCl) when heated.
Black Precipitate with H2S
When hydrogen sulfide (H2S) gas is passed through the hot acidic solution containing the dissolved white precipitate, a black precipitate is obtained. This black precipitate is a sulfide salt of the metal cation, indicating the presence of a metal that forms an insoluble sulfide.
Identification of the Substance
Based on the observations, the substance can be identified as a lead (Pb2+) salt.
Reasoning
- The white precipitate formed with dilute HCl that dissolves on heating suggests the presence of a lead chloride salt (PbCl2).
- The black precipitate obtained when H2S is passed through the hot acidic solution confirms the presence of a lead sulfide salt (PbS).
- Therefore, the substance in question is a lead (Pb2+) salt.
Conclusion
In conclusion, the correct answer is option 'D' - Pb2+ salt. The observations of a white precipitate with dilute HCl that dissolves on heating, followed by the formation of a black precipitate with H2S, indicate the presence of a lead (Pb2+) salt.
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An aqueous solution of a substan ce gives a white precipitate on treat...
PbCl2 is insoluble in cold water, soluble in hot water and PbS is black ppt in acidic medium.
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An aqueous solution of a substan ce 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 aa)Hg22+ saltb)Cu2+ saltc)Ag+ saltd)Pb2+ saltCorrect answer is option 'D'. Can you explain this answer?
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An aqueous solution of a substan ce 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 aa)Hg22+ saltb)Cu2+ saltc)Ag+ saltd)Pb2+ saltCorrect answer is option 'D'. Can you explain this answer? for JEE 2024 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about An aqueous solution of a substan ce 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 aa)Hg22+ saltb)Cu2+ saltc)Ag+ saltd)Pb2+ saltCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for JEE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for An aqueous solution of a substan ce 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 aa)Hg22+ saltb)Cu2+ saltc)Ag+ saltd)Pb2+ saltCorrect answer is option 'D'. Can you explain this answer?.
Solutions for An aqueous solution of a substan ce 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 aa)Hg22+ saltb)Cu2+ saltc)Ag+ saltd)Pb2+ saltCorrect answer is option 'D'. Can you explain this answer? in English & in Hindi are available as part of our courses for JEE.
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