Q.

In the following reaction sequence in aqueous solution, the species X, Y and Z, respectively are?S2O32−→Ag+XClearSolution→Ag+YWhitePrecipitate→lime waterYBlackPrecipitate

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a

AgS2O323−,Ag2S2O3,Ag2S

b

AgS2O325−,Ag2SO3,Ag2S

c

AgS2O323−,Ag2S2O3,Ag

d

AgSO333−,Ag2SO4,Ag

answer is A.

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Detailed Solution

Na2S2O3+Ag+→AgS2O32−3→Ag+Ag2S2O3→∆Ag2SIn presence of excess of hypo, formation of soluble complex takes place. If silver is in excess, a white precipitate of silver thiosulfate is formed. On heating the resultant aqueous suspension, a black precipitate of silver sulfide is obtained.
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