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

Question

$C{O_3}^{2 - },\,\,N{O_3}^ - $

$C{lO_3}^{2 - },\,\,C{O_3}^{2 - }$

$S{O_3}^{2 - },\,\,N{O_3}^ - $

$Cl{O_3}^ - ,\,\,S{O_3}^{2 - }$

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