Q.

The size of the following species increases in the order

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a

Mg2+<  Na+ <  F−<  Al

b

F− < Al < Na+ >Mg2+

c

Al <  Mg

d

Na+ 

answer is A.

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Detailed Solution

Mg2+<  Na+<   F−<  Al  F− has bigger size than Mg2+  and   Na+due to small nuclear charge.
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