(a) CO32−:6+24+2=32;sp2; trigonal planar NO3−:7+24+1=32;sp2; trigonal planar Hence, these are isoelectronic as well as isostructural. (b) ClO3−:17+24+1=42;sp3, trigonal pyramidal CO32−:6+24+2=32;sp2, trigonal planar Hence, these are neither isoelectronic nor isostructural. (c) SO32−:16+24+2=42;sp3, trigonal pyramidal NO3−:7+24+1=32;sp2, trigonal planar Theseare neither isoelectronic nor isostructural (d) ClO3−:17+24+1=42;sp3, trigonal pyramidal SO32−:16+24+2=42;sp3, trigonal pyramidal Hence, these are isoelectronic as well as isostructural.