Electronic Configuration and Magnetism of Lanthanoid Ions

2024 1 question

1. 1 The d- and f-Block Elements Hard
   The pair of lanthanoid ions which are diamagnetic is
   A $Gd^{3+}$ and $Eu^{3+}$ B $Pm^{3+}$ and $Sm^{3+}$ C $Ce^{4+}$ and $Yb^{2+}$ D $Ce^{3+}$ and $Eu^{2+}$
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