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Q.
The solubility of iodine in water increases in the presence of
The p-Block Elements - Part2
Solution:
Iodine has the least affinity for water and is only slightly soluble in it. However, it dissolves in $10\%$ aq. solution of $KI$ due to the formation of a complex ion i.e. $I_3^-$
$I_2 + KI \rightleftharpoons KI_3$ or $I_2+ I^- \rightleftharpoons I_3^-$ (complex ion)