(B) The central iodine atom in $I_{3}^{-}$ undergoes $sp^{3}d$ hybridization. It has $3$ lone pairs of electrons in the equatorial positions and $2$ b

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(B) The central iodine atom in $I_{3}^{-}$ undergoes $sp^{3}d$ hybridization. It has $3$ lone pairs of electrons in the equatorial positions and $2$ bonding pairs in the axial positions. According to $VSEPR$ theory,the presence of $3$ lone pairs results in a linear geometry with a bond angle of $180^{\circ}$.