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What happens when silver nitrate solutio...

What happens when silver nitrate solution is added to `Na_(2)S_(2)O_(3)` solution and then content is allowed to keep for a longer period?

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The correct Answer is:
White precipitate of `Ag_(2)S_(2)O_(3)` is obtained which turns yellow, brown and finally black on keeping.
`AgNO_(3)+Na_(2)S_(2)O_(3)toAg_(2)S_(2)O_(3)darr("white")+2NaNO_(3)`
`Ag_(2)S_(2)O_(3)+H_(2)OtoAg_(2)Sdarr("black")H_(2)SO_(4)`
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