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Solution


Q.

From the following pairs of ions which one is not an iso-electronic pair                [2021]
 
1 Fe2+,Mn2+  
2 O2-,F-  
3 Na+,Mg2+  
4 Mn2+,Fe3+  

Ans.

(1)

Among the given pairs of ions, Fe2+ and Mn2+ is not an iso-electronic pair.