JEE Advanced | 2015Gaseous StateHard
Question
The pair(s) of ions where BOTH the ions are precipitated upon passing H2S gas in presence of dilute HCl, is(are)
Options
A.Ba2+, Zn2+
B.Bi3+, Fe3+
C.Cu2+, Pb2+
D.Hg2+, Bi3+
Solution
(A) Ba+2 
No ppt [because BaS is soluble in water]
Zn+2
No ppt [because Zn+2 form ZnS in ammonical solution (IV group)
(large Ksp of ZnS)]
(B) Bi3+
Bi2S3 ↓ [Bi3+ is II group cation
Brown/black ppt
Fe+3
Fe+2 + S [because in acidic solution Fe+3 show redox reaction with H2S]
(C) Cu+2
CuS↓ [Cu+2 is II group cation]
black ppt
Pb2+
PbS↓ [Pb2+ is also II group cation]
black ppt
(D) Hg2+
HgS↓ [Hg2+ is II group cation]
black ppt
Bi3+
Bi2S3↓ [Bi3+ II group cation]
black/brown ppt
No ppt [because BaS is soluble in water]Zn+2
No ppt [because Zn+2 form ZnS in ammonical solution (IV group)(large Ksp of ZnS)]
(B) Bi3+
Bi2S3 ↓ [Bi3+ is II group cationBrown/black ppt
Fe+3
Fe+2 + S [because in acidic solution Fe+3 show redox reaction with H2S](C) Cu+2
CuS↓ [Cu+2 is II group cation]black ppt
Pb2+
PbS↓ [Pb2+ is also II group cation]black ppt
(D) Hg2+
HgS↓ [Hg2+ is II group cation]black ppt
Bi3+
Bi2S3↓ [Bi3+ II group cation]black/brown ppt
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