The $I {_{3}}^{-}$ ion has :

five equatorial lone pairs on the central atom and two axial bonding pairs in a trigonal bi-pyramidal arrangement

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five equatorial lone pairs on the central atom and two axial bonding pairs in a pentagonal bi-pyramidal arrangement

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three equatorial lone pairs on the central atom and two axial bonding pairs in a trigonal bi-pyramidal arrangement

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two equatorial lone pairs on the central atom and three axial bonding pairs in a trigonal bi-pyramidal arrangement

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Solution

The correct option is C three equatorial lone pairs on the central atom and two axial bonding pairs in a trigonal bi-pyramidal arrangement
The $I_{3} -$ (triiodide ion) has 3 equatorial lone pairs on the central atoms and 2 axial bonding pairs in a trigonal bi-pyramidal arrangement.

Hence the correct option is C.

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