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From each pair given below, identify the ion which is larger in size
Pair-1: ${Li}^{+}, {Mg}^{2 +}$
Pair-2: ${Cu}^{+ 2}, {Zn}^{+ 2}$
Pair-3: ${Na}^{+}, F^{-}$
Pair-4: ${Ce}^{3 +}, \Pr^{3 +}$

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${Li}^{+}, {Zn}^{+ 2}, F^{-}, {Ce}^{3 +}$

${Mg}^{2 +}, {Zn}^{+ 2}, F^{-}, \Pr^{3 +}$

${Mg}^{2 +}, {Zn}^{+ 2}, F^{-}, {Ce}^{3 +}$

${Mg}^{2 +}, {Cu}^{+ 2}, F^{-}, \Pr^{3 +}$

answer is A.

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Detailed Solution

1. ${Li}^{+} = (76 pm), {Mg}^{+ 2} = (72 pm)$
2. ${Cu}^{+ 2} < {Zn}^{+ 2}$
3. $N a^{+} < F^{-} (I s o e l e c t r o n i c)$
4. $C e^{+ 3} > \Pr^{+ 3} (L a t h a n o i d e c o n t r a c t i o n)$

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