AIPMT PRELIMS2005Chemistry-Qualitative Analysis
AIPMT PRELIMS 2005 Chemistry Group Separation MCQ Question
Type: MCQ-conceptual-Medium-Class 12
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:
A
presence of HCl decreases the sulphide ion concentration
B
presence of HCl increases the sulphide ion concentration
C
solubility product of group II sulphides is more than that of group IV sulphides
D
solubility product of group II sulphides is less than that of group IV sulphides
Correct Answer
Option A
Detailed Explanation
HCl decreases the sulphide ion concentration, preventing precipitation of less soluble group IV sulphides.
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