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In presence of HCl, `H_(2)S` results the precipitation of group-2 radicals but not group-4 radicals during qualitative analysis. It is due to
A. higher concentration of `H^(+)`
B. lower concentration of `H^(+)`
C. higher concentration of `S^(2-)`
D. lower concentration of `S^(2-)`

1 Answer

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Correct Answer - D
Dissociation of `H_(2)S` is suppressed in presence of HCl due to common ion effect. This decreases the `S^(2-)` ion concentration and hence only group 2 radicals are precipitated as they have low solubility products.

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