Year: 2024
Topic: The d-and f-Block Elements
Time :
1.
The pair of lanthanoid ions which are diamagnetic is
(1). \(\text{Gd}^{3+}\) and \(\text{Eu}^{3+}\)
(2). \(\text{Pm}^{3+}\) and \(\text{Sm}^{3+}\)
(3). \(\text{Ce}^{4+}\) and \(\text{Yb}^{2+}\)
(4). \(\text{Ce}^{3+}\) and \(\text{Eu}^{2+}\)