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Colourless salt (A) decolourise I(2) sol...

Colourless salt `(A)` decolourise `I_(2)` solution and gives white precipitate (change to black) with `AgNO_(3)` solution. `(A)` also produces pink colour with `FeCl_(3)` solution. Identify `(A)` and explain reactions.

Text Solution

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(A):`Na_(2)S_(2)O_(3)`
`Na_(2)S_(2)O_(3)+2AgNO_(3)toAg_(2)S_(2)O_(3)+2NaNO_(3)`
`Ag_(2)S_(2)O_(3)+H_(2)OtoH_(2)SO_(4)+underset(Black)(Ag_(2))Suparrow`
`2FeCI_(3)+2Na_(2)S_(2)O_(3)to2FeCI_(3)+Na_(2)S_(4)O_(5)+2NaCI`
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