In which pair do both compounds exhibit predominantly ionic bonding? A)RbCl and CaO B)PCl₅ and HF C)KI and O₃ D)Na₂SO₃ and BH₃ E)NaF and H₂O

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RbCl and CaO both have large differences in electronegativity between the cation and anion, resulting in predominantly ionic bonding. PCl5 and HF (B) exhibit more covalent character due to their smaller electronegativity differences. KI (C) has some covalent character due to the similar electronegativities of K and I. Na2SO4 and BH3 (D) also exhibit some covalent character. NaF (E) has some covalent character due to the small electronegativity difference between Na and F, but it is still predominantly ionic.

In Which Pair Do Both Compounds Exhibit Predominantly Ionic Bonding