Analytical ChemistryHard
Question
A white crystalline substance dissolves in water. On passing H2S in this solution, a black precipitate is obtained. The black precipitate dissolves completely in hot HNO3. On adding a few drops of concentrated H2SO4, a white precipitate is obtained. This precipitate is that of
Options
A.BaSO4
B.SrSO4
C.PbSO4
D.CdSO4
Solution
Pb2+ + H2S → PbS ↓ (black) + 2H+ ; 3PbS + 8HNO3 → 3Pb(NO3)2 + 2NO↑ + 3S↓ + 4H2O.
Pb2+ + SO42- → PbSO4 ↓ (white).
Pb2+ + SO42- → PbSO4 ↓ (white).
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