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Question

When AgNO3 is treated with hypo solution, a white ppt of A is formed. This gets dissolved when excess of hypo solution is added due to the formation of compound B. Precipitate A on boiling with water turns black due to the formation of C. Find the incorrect option:

A
White precipitate is due to Na3[Ag(S2O3)2]
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B
Black precipitate is due to Ag2S
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C
Along with C, H2SO4 is also formed
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D
Average oxidation state of S in hypo solution is +2
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Solution

The correct option is A White precipitate is due to Na3[Ag(S2O3)2]
2AgNO3+Na2S2O3Ag2S2O3white ppt(A)+2NaNO3
Ag2S2O3+3Na2S2O32Na3[Ag(S2O3)2]B
Ag2S2O3+H2OboilAg2SC+SO24+2H+
So,
a) White precipitate is due to Ag2S2O3
b) Black precipitate is due to Ag2S
c) Along with C, H2SO4 is also formed
d) Average oxidation state of S in Na2S2O3 is +2.

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