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Q.

The ionic radii of O2−,F−⋅Na+and Mg2+ are in the order

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a

O2>F->Na+>Mg2+

b

F->O2−>Na+1>Mg+2

c

O2−>F−>Mg+2>Na+1

d

Mg2+>Na+>F−>O2−

answer is A.

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Detailed Solution

O      F       Na     Mg2+Z              8     9     11     12 No.of e-10    10     10      10In isoelectronic species greater is Z smaller is radius so order is O2−>F-1>Na+>Mg2+
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