The ionic compound, AlI3, is composed of which of the following pairs of ions?

Question

? 1 Al+ ion and 3 I- ions
? 1 Al3- ion and 3 I+ ions
? 1 Al3+ ion and 3 I- ions
? 1 Al3+ ion and 1 I3- ion
? 1 Al2+ ion and 2 I- ions

Answer 1

The ionic compound AlI3 is composed of:

1 Al³⁺ ion and 3 I⁻ ions.

In AlI3, aluminum (Al) typically has a +3 oxidation state (Al³⁺) and iodine (I) typically has a -1 oxidation state (I⁻). Therefore, the correct pair of ions is:

• 1 Al³⁺ ion and 3 I⁻ ions.