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CGP EDU Academic Team
Published on: August 14, 2026
H 2 S in the presence of HCl precipitates ΙΙ group but not Ι V group because
Text Solution
Verified by ExpertsThe correct answer is:
C
H 2 S 
2H + + S 2– ; HCl 
H 2+ + Cl – .
Due to common ion effect, the ionisation of H 2 S is suppressed and thus low concentration of S 2– ions is obtained. This much of S 2– ions concentration is enough to precipitate only II nd group cations (because of the low K SP of II nd group sulphides).
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