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  4. Solubility of iodine in water may be increased by adding:

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Q. Solubility of iodine in water may be increased by adding:

ManipalManipal 2006The p-Block Elements - Part2

Solution:

The solubility of $I _{2}$ in water increases by the addition of KI due to formation of polyhalide ion, i.e., $I _{3}^{-}$.
$KI + I _{2} \longrightarrow KI _{3}$