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Match the species with their respective ionic size
Column – I Column – II
P $M g^{+ 2}$ 1 $1.26 A^{0}$
Q $O^{- 2}$ 2 $1.16 A^{0}$
R $F^{-}$ 3 $1.19 A^{0}$
S $N a^{+}$ 4 $0.72 A^{0}$

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P-4; Q-1; R-3; S-2

P-1; Q-4; R-2; S-3

P-4; Q-1; R-2; S-3

P-2; Q-3; R-1; S-4

answer is D.

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Detailed Solution

In isoelectronic ions increases the nuclear charge decrease the ionic radius order is $O^{- 2} > F^{-} > N a^{+} > M g^{+ 2}$
$1.26 A^{0}, 1.19 A^{0}, 1.16 A^{0}, 0.72 A^{0} .$

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