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).
Create a free account to view solution
View Solution FreeMore Analytical Chemistry Questions
Which one of the following can be used in place of NH4Cl for the identification of the third group radicals?...A compound (X) reacts in the following ways.The compound (X) is likely to be...Which of the following anion(s) evolve(s) reddish brown gas with concentrated H2SO4?...Among ${Fe}^{2 +},{Fe}^{3 +},{Cr}^{2 +}$ and ${Zn}^{2 +}$, the ion that shows positive borax bead test and with highest ...The Lassaigne′s extract is boiled with dil. HNO3 before testing for halogens because...