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Which of the following pairs of ions are isoelectronic and isostructural?

1. ClO3−, CO32−
2. SO32−, NO3−
3. ClO3−, SO32−
4. CO32−, SO32−

Correct answer: ClO3−, CO32−

Solution

Isoelectronic species have the same number of electrons, and isostructural species have the same geometry. Both ClO3− and CO32− have 32 electrons and a trigonal planar structure, making them isoelectronic and isostructural.

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