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Identify a reagent or reagents from the Group 1 or II qualitative labs that would do...

Identify a reagent or reagents from the Group 1 or II qualitative labs that would do the following:
a) precipitate silver ions but not animony (III) ions
b) precipitate tin (iv) ions but not iron (III) ions
c) precipitate bismuth (III) ions but not copper (II) ions

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