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Question

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.

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