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
Create a free account to view solution
View Solution FreeMore Gaseous State Questions
Three footballs are respectively filled with nitrogen, hydrogen and helium. If the leaking of the gas occurs with time f...In the figure-2 the pressure of the confined gas will be...A gaseous reaction, A2(g) ⇋ B(g) + 1/2C(g) shows increase in the pressure from 100 mm to 120 mm in 5 min, The rate...For gaseous state, if most probable speed is denoted by C*, average speed by and mean square speed by C, then for a larg...If the pressure of a gas contained in a closed vessel is increased by 0.4 % when heated by 1oC its initial temperature m...