Chemistry - Coordination Chemistry Question with Solution | TestHub

SO₃²⁻ and ClO₃⁻ are both 26 valence electron species and have a trigonal pyramidal shape, so they are isoelectronic and isostructural.

CO₃²⁻ and NO₃⁻ both have 24 valence electrons and are both trigonal planar; hence, they are also isoelectronic and isostructural.

SO₃²⁻ and NO₃⁻ are not isostructural.

ClO₃⁻ and CO₃²⁻ also do not match in structure.

So, the correct pairs are (B) and (C).