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JEE Main 20249 AprilMorning Shift
Exam
JEE Main
Year
2024
Date
9 April
Shift
Morning Shift
Subject
Chemistry
Chapter
d and f Block Elements

JEE Main 2024 · 9 April · Morning Shift · Chemistry · d and f Block Elements

Number of colourless lanthanoid ions among the following is...

Number of colourless lanthanoid ions among the following is ________ (\mathrm{Eu}^{3+}, \mathrm{Lu}^{3+}, \mathrm{Nd}^{3+}, \mathrm{La}^{3+}, \mathrm{Sm}^{3+})

Correct answer

0

Step-by-step solution

La+3−[Xe]4f0Nd+3−[Xe]4f3Sm+3−[Xe]4f5Eu+3−[Xe]4f6Lu+3−[Xe]4f14\begin{aligned} & \mathrm{La}^{+3}-[\mathrm{Xe}] 4 \mathrm{f}^0 \\ & \mathrm{Nd}^{+3}-[\mathrm{Xe}] 4 \mathrm{f}^3 \\ & \mathrm{Sm}^{+3}-[\mathrm{Xe}] 4 \mathrm{f}^5 \\ & \mathrm{Eu}^{+3}-[\mathrm{Xe}] 4 \mathrm{f}^6 \\ & \mathrm{Lu}^{+3}-[\mathrm{Xe}] 4 \mathrm{f}^{14} \end{aligned}\mathrm{La}^{+3}andand\mathrm{Lu}^{+3}$ do not show any colour because no unpaired electron is present.
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