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JEE Advanced 2025Paper 1
Exam
JEE Advanced
Year
2025
Paper
Paper 1
Subject
Chemistry
Chapter
d and f Block Elements

JEE Advanced 2025 · Paper 1 · Chemistry · d and f Block Elements

The pair(s) of diamagnetic ions is(are)

The pair(s) of diamagnetic ions is(are)

Options

  1. ALa3+,Ce4+\mathrm{La}^{3+}, \mathrm{Ce}^{4+}
  2. BYb2+,Lu3+\mathrm{Yb}^{2+}, \mathrm{Lu}^{3+}
  3. CLa2+,Ce3+\mathrm{La}^{2+}, \mathrm{Ce}^{3+}
  4. DYb3+,Lu2+\mathrm{Yb}^{3+}, \mathrm{Lu}^{2+}

Correct answer

A. La3+,Ce4+\mathrm{La}^{3+}, \mathrm{Ce}^{4+}

Step-by-step solution

La+3→[54Xe]4f0 -diamagnetic Yb+2→[54Xe]4f14 -diamagnetic Lu+3→[54Xe]4f14 -diamagnetic La+2→[54Xe]5d1 -paramagnetic Ce+4→[54Xe]4f0 -diamagnetic Ce+3→[54Xe]4f1 -paramagnetic Yb+3→[54Xe]4f13 -paramagnetic Lu+2→[54Xe]4f145d1 -paramagnetic \begin{aligned} \mathrm{La}^{+3} \rightarrow\left[{ }_{54} \mathrm{Xe}\right] 4 \mathrm{f}^0 & \text{ -diamagnetic } \\ \mathrm{Yb}^{+2} \rightarrow\left[{ }_{54} \mathrm{Xe}\right] 4 \mathrm{f}^{14} & \text{ -diamagnetic } \\ \mathrm{Lu}^{+3} \rightarrow\left[{ }_{54} \mathrm{Xe}\right] 4 \mathrm{f}^{14} & \text{ -diamagnetic } \\ \mathrm{La}^{+2} \rightarrow\left[{ }_{54} \mathrm{Xe}\right] 5 \mathrm{ d}^1 & \text{ -paramagnetic } \\ \mathrm{Ce}^{+4} \rightarrow\left[{ }_{54} \mathrm{Xe}\right] 4 \mathrm{f}^0 & \text{ -diamagnetic } \\ \mathrm{Ce}^{+3} \rightarrow\left[{ }_{54} \mathrm{Xe}\right] 4 \mathrm{f}^1 & \text{ -paramagnetic } \\ \mathrm{Yb}^{+3} \rightarrow\left[{ }_{54} \mathrm{Xe}\right] 4 \mathrm{f}^{13} & \text{ -paramagnetic } \\ \mathrm{Lu}^{+2} \rightarrow\left[{ }_{54} \mathrm{Xe}\right] 4 \mathrm{f}^{14} 5 \mathrm{ d}^1 & \text{ -paramagnetic }\end{aligned}
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