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

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${CO}_{3}^{2 -}, {NO}_{3}^{-}$

${ClO}_{3}^{-}, {CO}_{3}^{2 -}$

${SO}_{3}^{2 -}, {NO}_{3}^{-}$

${ClO}_{3}^{-}, {SO}_{3}^{2 -}$

answer is A.

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Detailed Solution

$(a) {CO}_{3}^{2 -} : 6 + 24 + 2 = 32; {sp}^{2}; trigonal planar$

${NO}_{3}^{-} : 7 + 24 + 1 = 32; {sp}^{2}; trigonal planar$

These are isoelectronic as well as isostructural.

${(b) ClO}_{3}^{-} : 17 + 24 + 1 = 42; {sp}^{3}, trigonal pyramidal$

${CO}_{3}^{2 -} : 6 + 24 + 2 = 32; {sp}^{2}, trigonal planar$

$These are neither isoelectronic nor isostructural$

$(c) {SO}_{3}^{2 -} : 16 + 24 + 2 = 42; {sp}^{3}, trigonal pyramidal$

${NO}_{3}^{-} : 7 + 24 + 1 = 32; {sp}^{2}, trigonal planar$

$These are neither isoelectronic nor isostructural$

$(d) {ClO}_{3}^{-} : 17 + 24 + 1 = 42; {sp}^{3}, trigonal pyramidal$

${SO}_{3}^{2 -} : 16 + 24 + 2 = 42; {sp}^{3}, trigonal pyramidal$

These are isoelectronic but not isostructural.

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