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NEET 2003
Exam
NEET
Year
2003
Subject
Chemistry
Chapter
d and f Block Elements

NEET 2003 · Chemistry · d and f Block Elements

The correct order of ionic radii of Y^ 3+ , La^ 3+ and Lu^ 3+ is:...

The correct order of ionic radii of Y3+\mathrm{Y}^{3+}, La3+\mathrm{La}^{3+} and Lu3+\mathrm{Lu}^{3+} is: (Atomic nos Y=39,La=57,Eu=63Lu\mathrm{Y}=39, \mathrm{La}=57, \mathrm{Eu}=63 \mathrm{Lu} =71=71 )

Options

  1. AY3+<La3+<Eu3+<Lu3+\mathrm{Y}^{3+} < \mathrm{La}^{3+} < \mathrm{Eu}^{3+} < \mathrm{Lu}^{3+}
  2. BY3+<Lu3+<Eu3+<La3+\mathrm{Y}^{3+} < \mathrm{Lu}^{3+} < \mathrm{Eu}^{3+} < \mathrm{La}^{3+}
  3. CLu3+<Eu3+<La3+<Y3+\mathrm{Lu}^{3+} < \mathrm{Eu}^{3+} < \mathrm{La}^{3+} < \mathrm{Y}^{3+}
  4. DLa3+<Eu3+<Lu3+<Y3+\mathrm{La}^{3+} < \mathrm{Eu}^{3+} < \mathrm{Lu}^{3+} < \mathrm{Y}^{3+}

Correct answer

B. Y3+<Lu3+<Eu3+<La3+\mathrm{Y}^{3+} < \mathrm{Lu}^{3+} < \mathrm{Eu}^{3+} < \mathrm{La}^{3+}

Step-by-step solution

Eu and Lu are the members of lanthanide series (so they show lanthanide contraction)andLaand \mathrm{La} is the representative element of all elements of such series and Y3+\mathrm{Y}^{3+} ion has lower radii as comparison to La3+\mathrm{La}^{3+} because it lies immediately above it in the periodic table. \mathrm{Y}^{3+} < Lu3+\mathrm{Lu}^{3+}< Eu3+\mathrm{Eu}^{3+}< La3+\mathrm{La}^{3+}
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