Question

The pair of Lanthanoid ions which are diamagnetic is

• A. Ce⁴⁺ and Yb²⁺
• B. Ce³⁺ and Eu²⁺
• C. Gd³⁺ and Eu³⁺
• D. Pm³⁺ and Sm³⁺

Answer 1

The Correct Option is A

Step 1: Identify Diamagnetic Ions

Diamagnetic ions are characterized by the absence of unpaired electrons, indicating a fully paired electron configuration.

Step 2: Analyze Provided Ions

• Ce³⁺: Possesses 1 unpaired electron, classifying it as paramagnetic.
• Eu²⁺: Possesses 7 unpaired electrons, classifying it as paramagnetic.
• Gd³⁺: Possesses 7 unpaired electrons, classifying it as paramagnetic.
• Eu³⁺: Lacks unpaired electrons, classifying it as diamagnetic.
• Ce⁴⁺: Lacks unpaired electrons, classifying it as diamagnetic.
• Yb²⁺: Lacks unpaired electrons, classifying it as diamagnetic.

Step 3: Conclusion

The identified diamagnetic ions are: Ce⁴⁺ and Yb²⁺.