NEET2024Chemistry-f-Block Elements
NEET 2024 Chemistry Lanthanoids MCQ Question
Type: MCQ-conceptual-Medium-Class 12
The pair of lanthanoid ions which are diamagnetic is
A
Gd³⁺ and Eu³⁺
B
Pm³⁺ and Sm³⁺
C
Ce⁴⁺ and Yb²⁺
D
Ce³⁺ and Eu²⁺
Correct Answer
Option C
Detailed Explanation
Ce⁴⁺ and Yb²⁺ are diamagnetic because they have no unpaired electrons in their f-orbitals. Ce⁴⁺ has an empty f-orbital, and Yb²⁺ has a completely filled f-orbital.
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