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1. $H^+$ (in acid medium) |
$S_2O_3^{2-}+2H^+$ $\longrightarrow$ $S^o+SO_2+H_2O$ - Yellowish-white sulphur milk - $SO_2+H_2O$ $\leftrightarrows$ $H_2SO_3$ has in acid medium the properties of the sulfite ion, particularly discolorates the permanganate ion. |
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2. $I_2$ (in neutral medium) |
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$2S_2O_3^{2-}+I_2$ $\longrightarrow$ $S_4O_6^{2-}+2I^-$ - discoloration of iodine |