1.

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

Answer»

LOWER concentration of `H^(+)`
Lower concentration of `S^(2-)`
Higher concentration of `H^(+)`
Higher concentration of `S^(2-)`

Solution :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.


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