When $H_2S$ gas is passed through a solution containing $HCl$ during qualitative analysis,cations of the second group are precipitated,but cations of the fourth group are not precipitated because:
- AThe solubility product of the second group sulfides is lower than that of the fourth group sulfides.
- BThe common ion effect of $Cl^-$ ions decreases the concentration of $S^{2-}$ ions.
- CThe common ion effect of $H^+$ ions decreases the concentration of $S^{2-}$ ions.
- DThe solubility product of the fourth group sulfides is higher than that of the second group sulfides.
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