In the second group of qualitative analysis, H2S is passed through a solution acidified with HCl in order to :
A
Limit the concentration of S2− ions
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B
Increase the solubility of H2S
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C
Increase the concentration of S2− ions
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D
Add the Cl− ions
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Solution
The correct option is A Limit the concentration of S2− ions Option (A) is correct. In the second group of qualitative analysis, H2S is passed through a solution acidified with HCl in order to limit the concentration of S2− ions. The dissociation of H2S is suppressed in the presence of HCl due to common ion effect, and thus, only II group radicals are precipitated.