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

(i) CO₃^2-  , NO₃^- 

(ii) ClO₃^-  , CO₃^2- 

(iii) SO₃^2- , NO₃^- 

(iv) ClO₃^-  , SO₃^2- 

<p><span data-teams="true">This is a multiple choice answer as classified in NCERT Exemplar</span></p><p>Correct option (i)</p><p>The compound has the following number of electrons:</p><p>NO₃^-&nbsp;&nbsp;=&nbsp; 32e^-&nbsp;</p><p>CO₃^2-&nbsp;&nbsp;=&nbsp; 32e^-&nbsp;</p><p>ClO₃^-&nbsp;&nbsp;=&nbsp; 42e^-&nbsp;</p><p>SO₃&nbsp;^-&nbsp;&nbsp;=&nbsp; 42e^-&nbsp;</p><p><span data-teams="true">Hence, &nbsp;NO₃^-&nbsp;and CO₃^2-&nbsp;&nbsp;are isoelectronic</span></p>

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