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Which of the following two are isostructural?

1. NH₃, BF₃
2. PCl₅, ICl₄
3. XeF₂, IF₂⁻
4. CO₃²⁻, SO₃²⁻

Correct answer: XeF₂, IF₂⁻

Solution

XeF₂ and IF₂⁻ are isostructural because both have a linear geometry with the same number of bonding and lone pairs, following the VSEPR theory.

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