The pair of Lanthanoid ions which are diamagnetic is
- Ce4+ and Yb2+
- Ce3+ and Eu2+
- Gd3+ and Eu3+
- Pm3+ and Sm3+
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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