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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. Identigy `(A)` and explain reactions.

Text Solution

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`Na_2S_2O_3` (colourless)
`2Na_2S_2O_3+I_2toNa_2S_4O_6+2Nal`: [decolourises `I_2` solution]
`Na_2S_2O_3overset(2AgNO_3)toAg_2S_2O_3overset(H_2O)toAgGdarr+H_2SO_4`
`2Na_2S_2O_3+2FeCl_3to2FeCl_2+Na_2S_4O_6+2NaCl`
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