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H₂S gas when passed through a solution of cations containing HCl precipitates the cations of second group of qualitative analysis but not those belonging to the fourth group. It is because

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Presence of HCl decreases the sulphide ion concentration

Presence of HCl increases the sulphide ion concentration

Solubility product of group II sulphides is more than that of group IV sulphides

Sulphides of group IV cations are unstable in HCl

answer is A.

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Detailed Solution

Because of HCl, S^2– is present in low concentration and hence group II elements with very low K_sp values are precipitated. Group IV elements (sulphides) have higher K_sp values.

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