The acidic solution of $S_2O_3^{2-}$ is converted to ....... in the presence of $I_2$.
- A$S_4O_6^{2-} + I^{-}$
- B$SO_4^{2-} + I^{-}$
- C$SO_3 + I^{-}$
- D$S_4O_6^{2-} + I_3^-$
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