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Why only As^3+ gets precipitated as As2S3 and not Zn^2+ as ZnS when H2S is passed through an acidic solution containing As^3+ and Zn^2+?

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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

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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.

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