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Correct decreasing order of radii of O, F^–, F and O^–.

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O^–, F, F^–, O

O^–, O, F, F^–

O^–, F^–, O, F

F^–, O^–, F, O

answer is B.

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Detailed Solution

Anions are larger than neutral atoms because effective nuclear charge in anions is lesser than in neutral atom
ionic size of
O^– > O
F^– >F
O^– > F^–
O^– > F^– > O > F.

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