\( \mathrm{H}_{2} \mathrm{~S} \) gas when passed through a solution...

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\( \mathrm{H}_{2} \mathrm{~S} \) gas when passed through a solution of cations containing \( \mathrm{HCl} \) precipitates the cations of second group of qualitative analysis but not those belonging to the fourth group. It is because
(a) presence of \( \mathrm{HCl} \) decreases the sulphide ion concentration.
(b) solubility product of group II sulphides is more than that of group IV sulphides.
(c) presence of \( \mathrm{HCl} \) increases the sulphide ion concentration.
(d) sulphides of group IV cations are unstable in \( \mathrm{HCl} \).
\( \mathrm{P} \)
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