In presence of HCl, `H_2S` results the precipitatiion of Group-2 elements but not Group -4 elements during qualitative analysis. If is due to

Options

A. higher concentration of `H^(+)`
B. lower concentration of `H^(+)`
C. higher concentration of `S^(2-)`
D. lower concentration of `S^(2-)`

Answer

B

Explanation

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 II radicals having low solubility product are precipitated .