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Equilibrium
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18/10/2021 2:03 pm
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Why only As3+ gets precipitated as As2S3 and not Zn2+ as ZnS when H2S is passed through an acidic solution containing As3+ and Zn2+?
(a) Solubility product of As2S3 is less than that of ZnS
(b) Enough As3+ are present in acidic medium
(c) Zinc salt does not ionise in acidic medium
(d) Solubility product changes in presence of an acid
1 Answer
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18/10/2021 2:05 pm
Correct answer: (a) Solubility product of As2S3 is less than that of ZnS
Explanation:
Ksp of As2S3 is less than ZnS. In acidic medium ionisation of H2S is suppressed (common ion effect) and Ksp of ZnS does not exceed.