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Which of the following pairs of species are both isoelectronic and isostructural?
Given species: NO₃⁻, CO₃²⁻, ClO₃⁻ and SO₃
1. NO₃⁻ and CO₃²⁻
2. SO₃ and NO₃⁻
3. ClO₃⁻ and CO₃²⁻
4. CO₃²⁻ and ClO₃⁻
Other Reason

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