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. Lower concentration of `H^(+)`
B. Lower concentration of `S^(2-)`
C. Higher concentration of `H^(+)`
D. Higher concentration of `S^(2-)`

Answer

B

Explanation

Dissociation of `H_2S` 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.