Question:

The pair of Lanthanoid ions which are diamagnetic is

Updated On: Mar 26, 2025
  • Ce4+ and Yb2+
  • Ce3+ and Eu2+
  • Gd3+ and Eu3+
  • Pm3+ and Sm3+
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The Correct Option is A

Solution and Explanation

Step 1: Identify Diamagnetic Ions

Diamagnetic ions are those that do not have unpaired electrons, meaning their electron configuration is fully paired.

Step 2: Examine the Given Ions

  • Ce³⁺: Has 1 unpaired electron, so it is paramagnetic.
  • Eu²⁺: Has 7 unpaired electrons, so it is paramagnetic.
  • Gd³⁺: Has 7 unpaired electrons, so it is paramagnetic.
  • Eu³⁺: Has no unpaired electrons, so it is diamagnetic.
  • Ce⁴⁺: Has no unpaired electrons, so it is diamagnetic.
  • Yb²⁺: Has no unpaired electrons, so it is diamagnetic.

Step 3: Conclusion

The correct answer is:

Option (1): Ce⁴⁺ and Yb²⁺ are diamagnetic.

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