Published by:
CGP EDU Academic Team
Published on: August 14, 2026
The reagent(s) that can selectively precipitate S 2– from a mixture of S 2– and 
in aqueous solution is(are)
Text Solution
Verified by ExpertsThe correct answer is:
A
(a or ac)
Sol. Cu 2+ + S 2– ⎯→ CuS ↓
Black ppt
Cu 2+ + SO 4 2– ⎯→ No. ppt
Ba 2+ + S 2– ⎯→ No. ppt
Ba 2+ + SO 4 2– ⎯→ BaSO 4 ↓
White ppt
Pb 2+ + S 2– ⎯→ PbS ↓ K sp (PbS) = 10 –28
Black ppt
Pb 2+ + SO 4 2– ⎯→ PbSO 4 K sp (PbSO 4 ) = 1.6 × 10 –8
white ppt
No ion is precipitated.
So Ans is A & C or A.
** In option C
as the differernce in K sp of PbS & PbSO 4 is large.
so only PbS is selectively precipitated.
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