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In the following reaction sequence in aqueous solution, the species X, Y and Z, respectively, are e precipitat black time with e precipitat white Ag solution clear Ag 2 3 2 O S Z Y X ⎯ ⎯ ⎯ → ⎯ ⎯ ⎯ → ⎯ ⎯ ⎯ → ⎯ + + −

1. [As(S 2 O 3 ) 2 ] 3– , Ag 2 S 2 O 3 , Ag 2 S
2. [Ag(S 2 O 3 ) 3 ] 5– , Ag 2 SO 3 , Ag 2 S
3. [Ag(SO 3 ) 2 ] 3– , Ag 2 S 2 O 3 , Ag
4. [Ag(SO 3 ) 3 ] 3– , Ag 2 SO 4 , Ag

Correct answer: [As(S 2 O 3 ) 2 ] 3– , Ag 2 S 2 O 3 , Ag 2 S

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