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Question

The correct order of radii is :


A
Na<Li<K
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B
Fe3+<Fe2+<Fe4+
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C
F<O2<N3
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D
N<Be<B
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Solution

The correct option is C F<O2<N3
Effective nuclear charge i.e. (ze) ratio decreases from F to N3
(ze)F=910=0.9
(ze)O2=810=0.8
(ze)N3=710=0.7
Effective nuclear charge is inversely proportional to anionic radii. Hence the radii follows the order :
F<O2<N3

Chemistry

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