The correct order of ionic radii for the given species is

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$K^{+} > N a^{+} > A l^{3 +} > M g^{2 +}$

$A l^{3 +} > M g^{2 +} > K^{+} > N a^{+}$

$N a^{+} > A l^{3 +} > M g^{2 +} > K^{+}$

$K^{+} > N a^{+} > M g^{2 +} > A l^{3 +}$

answer is B.

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Detailed Solution

Ionic radii of isoelectronic ions decreases with increase in the magnitude of nuclear charge. If the species is positively charged, then it has less ionic radii. Therefore; the correct order of ionic radii is

$K^{+} > N a^{+} > M g^{2 +} > A l^{3 +}$

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