The geometrical arrangement and shape of ${I_{3}}^{-}$ are respectively:

trigonal bipyramidal geometry, linear shape

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hexagonal geometry, T-shape

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triangular planar geometry, triangular shape

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tetrahedral geometry, pyramidal shape

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Solution

The correct option is A trigonal bipyramidal geometry, linear shape
The central iodine atom undergoes $s p^{3} d$ hybridization and has $3$ lone pairs of electrons and $2$ bond pairs of electrons.
Thus, ${I_{3}}^{-}$ has trigonal bipyramidal geometry and linear shape .

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