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Q.

Why only As+3 gets precipitated as As2S3 and not Zn2+ as ZnS when H2S is passed through an acidic solution containing As+3 and Zn+2 ?

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a

Solubility product changes in presence of an acid.

b

Enough As+3 are present in acidic medium

c

Zinc salt does not ionise in acidic medium

d

Solubility product of As2S3 is less than that of ZnS

answer is A.

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Detailed Solution

Solubility of group II catioins is less than those of group IV. Classification of cations in qualitative analysis is based on their order of solubilities of their different salts.

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