An aqueous solution of a halogen salt of pota | vedclass

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(C) The reaction described is the formation of polyhalide ions,specifically the triiodide ion $(I_3^-)$.$KI(aq) + I_2(s) \rightarrow KI_3(aq)$In this

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iodine

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(C) The reaction described is the formation of polyhalide ions,specifically the triiodide ion $(I_3^-)$.$KI(aq) + I_2(s) \rightarrow KI_3(aq)$In this reaction,$I^-$ acts as a Lewis base (donor) and $I_2$ acts as a Lewis acid (acceptor) to form the $I_3^-$ ion,which gives a characteristic brown-coloured solution.This property is specific to iodine among the given halogens.

An aqueous solution of a halogen salt of potassium reacts with the same halogen $X_2$ to give $KX_3$,a brown-coloured solution,in which the halogen exists as the $X_3^-$ ion,$X_2$ acts as a Lewis acid,and $X^-$ acts as a Lewis base. The halogen $X$ is:

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