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The species having smallest ionic radius is :

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a
Al3+
b
Ba2+
c
K+
d
Mg2+

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detailed solution

Correct option is A

Ionic radius of Al3+ is equal to 53.
Ionic radius of Ba2+ is equal to 135.
Ionic radius of K+ is equal to 138.
Ionic radius of Mg2+ is equal to 72.

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