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The correct order of ionic radii of Y3+, La3+, Eu3+ and Lu3+ is

1. La3+ < Eu3+ < Lu3+ < Y3+
2. Y3+ < La3+ < Lu3+ < Eu3+
3. Y3+ < Lu3+ < Eu3+ < La3+
4. Lu3+ < Eu3+ < La3+ < Y3+

Correct answer: Lu3+ < Eu3+ < La3+ < Y3+

Solution

The ionic radii decrease across the lanthanide series due to the lanthanide contraction. Hence, Lu3+ has the smallest radius, followed by Eu3+, La3+, and Y3+.

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