Why only As^+3 gets precipitated as As_2 S_3 and not Zn^+2 as ZnS when H_2 S is passed through an...

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Why only As^+3 gets precipitated as As_2 S_3 and not Zn^+2 as ZnS when H_2 S is passed through an acidic solution containing As^+3 and Zn^+2 ?
(a) Solubility product of As_2 S_3 is less than that of ZnS
(b) Enough As^+3 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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