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. Identigy `(A)` and explain reactions.

Colourless salt `(A)` decolourise `I_(2)` solution and gives white pre

1.	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. Identigy `(A)` and explain reactions.
Answer» `2S_(2)O_(3)^(2-)+I_(2) to S_(4)O_(6)^(2-) +2I^(-)` `S_(2)O_(3)^(2-) + 2Ag^(+) to Ag_(2)S_(2)O_(3) darr`(white) `Ag_(2)S_(2)O_(3) + H_(2)O to Ag_(2)S darr` (Black)`+H_(2)SO_(4)` `Fe^(3+) +2S_(2)O_(3)^(2-) to [Fe(S_(2)O_(3))_(2)]^(-)`(Pink or violet)

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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. Identigy `(A)` and explain reactions.

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