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An Intiative by Sri Chaitanya
a
Al3+ > Mg2+ > Na+ > F− > O2−
b
Na+ > Mg2+ > Al3+ > O2− > F−
c
Na+ > F− > Mg2+ > O2− > Al3+
d
O2−> F− > Na+ > Mg2+ > Al3+
answer is D.
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