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Q.The correct order of ionic radii of $Y^{3+}, La^{3+},$ and $Eu^{3+}$ is:

a

Y^{3+} < Eu^{3+} < La^{3+}

b

La^{3+} < Eu^{3+} < Y^{3+}

c

Eu^{3+} < La^{3+} < Y^{3+}

d

Y^{3+} < La^{3+} < Eu^{3+}

Correct Answer: Option A

The correct solution involves applying the fundamental concept to derive the final value step by step...

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