AIPMT PRELIMS 2005 Chemistry Group Separation MCQ Question
H₂S gas when passed through a solution of cations containing HCl precipitates the cations of second group of qualitative analysis but not those belonging to the fourth group. It is because:
presence of HCl decreases the sulphide ion concentration
presence of HCl increases the sulphide ion concentration
solubility product of group II sulphides is more than that of group IV sulphides
solubility product of group II sulphides is less than that of group IV sulphides
Correct Answer
Detailed Explanation
HCl decreases the sulphide ion concentration, preventing precipitation of less soluble group IV sulphides.
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