The correct statement about ICI₅ and \({\rm{ICI}}_4^ -\) is:

Concept:

ICl₅ (Iodine pentachloride) has the hybridization of sp³ d² (5 bp, 1lp) with the shape square pyramidal

(Lewis dot structure of ICI₅)

ICI₄^- has the hybridization of sp² d (4bp, 2lp) with the shape of square planar

(Lewis dot structure of ICI₄^‑)

Lewis structures (also known as Lewis dot structures or electron dot structures) are diagrams that represent the valence electrons of atoms within a molecule.

Square pyramidal is a molecular shape that results when there are five bonds and one lone pair on the central atom in the molecule because of the high symmetry of the octahedral arrangement, all six positions are equivalent, i.e. sp³d² (or d²sp³) hybrid orbitals arranged at 90° angles. Therefore, it does not matter in which position in the drawing we put the lone pair.

Square planar is a molecular shape that results when there are four bonds and two lone pairs on the central atom in the molecule. This molecule is made up of six equally spaced sp² d hybrid orbitals arranged at 90° angles.