Question:
H₂S gas when passed through a solution containing HCl precipitates cations of second group of qualitative analysis but not those of fourth group. It is because:
H₂S gas when passed through a solution containing HCl precipitates cations of second group of qualitative analysis but not those of fourth group. It is because:
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Common ion effect controls selective precipitation.
Updated On: Mar 18, 2026
- presence of HCl decreases sulphide ion concentration
- solubility product of group II sulphides is more than that of group IV
- presence of HCl increases sulphide ion concentration
- sulphides of group IV cations are unstable
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The Correct Option is A
Solution and Explanation
Step 1: Effect of HCl. HCl suppresses ionisation of H₂S.
Step 2: Sulphide ion concentration. Low sulphide concentration precipitates only group II cations.
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