`H_(2)S` gas when passed through a solution of cations containing `HCl` precipitates the cations of second group in qualitative analysis but not those belonging to the fourth group. It is becauseA. presence of HCI decreases the sulphide ion sulphide ion concentrationB. sulphides of group IV are unstable in HCIC. solubility product of group II sulphides is more than that of group IV sulphidesD. pressence of HCI increases the sulphide ion concentration

`H_(2)S` gas when passed through a solution of cations containing `HCl

1.	`H_(2)S` gas when passed through a solution of cations containing `HCl` precipitates the cations of second group in qualitative analysis but not those belonging to the fourth group. It is becauseA. presence of HCI decreases the sulphide ion sulphide ion concentrationB. sulphides of group IV are unstable in HCIC. solubility product of group II sulphides is more than that of group IV sulphidesD. pressence of HCI increases the sulphide ion concentration
Answer» Correct Answer - A `H_(2)S(aq.)hArr 2H^(+)(aq.)+S^(2-)(aq.)` `H_(2)S` is a weak acid. The presence of HCI suppresses the ionization of `H_(2)O` due to common ion effect. As a result, the concentration of sulphide ions decreases. Since `K_(sp)` values of group II sulphides are lower than those of group IV sulphides, only the cations of group II precipitate.

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