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The CORRECT order of radii is …………… 

(A) N < Be < B 

(B) F- < O2- <N3-

(C) Na < Li < K

(D) Fe3+< Fe2+ < Fe4+

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Correct option is: (B) F- < O2- <N3-

Isoelectronic species with more negative changes have large ionic radii than less negative. Therefore, the correct order of radii is \(N^{3^\circ} > O^{2^\circ} > F^-\)

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(B) F- < O2- <N3-

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