correct arrangement of following species...

correct arrangement of following species in the increasing order of their size is : `N^(3-),O^(2-),F^-,Na^+,Mg^(2+),Al^(3+)`

A

`O^(2-) lt F^(-) lt Na^(+) lt Al^(3+)`

B

`Al^(3+) lt Na^(+) lt F^(-) lt O^(2-)`

C

`O^(2-) lt Na^(+) lt F^(-) lt Al^(3+)`

D

`Al^(3+) lt F^(-) lt Na^(+) lt O^(2-)`

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The correct Answer is:

B

Among isoelectronic ions, anions will be larger in size than cations. For such species, the size decreases with increase in atomic number.

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