A) \[{{O}^{2-}}<{{F}^{-}}<N{{a}^{+}}<M{{g}^{2+}}\]
B) \[M{{g}^{2+}}<N{{a}^{+}}<{{F}^{-}}<{{O}^{2-}}\]
C) \[M{{g}^{2+}}<{{O}^{2-}}<N{{a}^{+}}<{{F}^{-}}\]
D) \[N{{a}^{+}}<M{{g}^{2+}}<{{F}^{-}}<{{O}^{2-}}\]
Correct Answer: B
Solution :
All the species are iso-electronic \[(10{{e}^{-}})\] For iso-electronic species more the positive change, smaller the ionic radii For iso-electronic species more negative change, bigger the ionic radii Hence the order is \[M{{g}^{2+}}<N{{a}^{+}}<{{F}^{-}}<{{O}^{2-}}\]
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