AIPMT 2005 Physics and Chemistry Paper

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Question : 99 of 100

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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-

Presence of HCl decreases the sulphide ion concentration.
Sulphides of group IV cations are unstable in HCl
Solubility product of group II sulphides is more than that of group IV sulphides
Presence of HCl increases the sulphides ion concentration

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