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Given below are two statements: one is labelled as
Assertion (A) and the other is labelled as Reason (R)
Assertion (A) : The ionic radii of \( \mathrm{O}^{2-} \) and \( \mathrm{Mg}^{2+} \) are same.
Reason (R): Both \( \mathrm{O}^{2-} \) and \( \mathrm{Mg}^{2+} \) are isoelectronic species.
In the light of the above statements, choose the correct answer from the options given below.
(a) Both (A) and (R) are true and (R) is the correct explanation of \( (\mathrm{A}) \).
(b) Both (A) and (R) are true but (R) is not the correct explanation of \( (A) \).
(c) (A) is true but \( (\mathrm{R}) \) is false.
(d) \( (\mathrm{A}) \) is false but \( (\mathrm{R}) \) is true.
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