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H2S gas when passed through a solution of cations containing HCl precipitates the cations of second groupof qualitative analysis but not those belonging to the fourth group. It is because (1) Presence of HCl decreases the sulphide ion concentration (2) Presence of HCl increases the sulphide ion concentration (3) Solubility product of group II sulphides is more than that of group IV sulphides (4) Sulphides of group IV cations are unstable in HCl

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