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Equilibrium — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistryEquilibrium3 Marks
Question
Why do we pass H2S gas in acidic medium in group 2?
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Answer

It is done so as to reduce concentration of [SP2-] by common ion effect so that only group 2 radicals get precipitated whereas higher group radicals do not as Ksp of group II sulphides is low as compared to Ksp of sulphides of higher groups.

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