MCQ
${I_2}$ dissolves in $KI$ solution due to the formation of
- A$K{I_2}$ and ${I^ - }$
- B${K^ + },{I^ - }$ and ${I_2}$
- ✓$KI_3 $
- DNone of these
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$(I)$ $S_2O_4^{2-}$ $(II)$ $S_2O_5^{2-}$ $(III)$ $S_2O_6^{2-}$

The substance $'B'$ is