MCQ
The pair of lanthanoid ions which are diamagnetic is
- A$\mathrm{Ce}^{3+}$ and $\mathrm{Eu}^{2+}$
- B$\mathrm{Gd}^{3+}$ and $\mathrm{Eu}^{3+}$
- C$\mathrm{Pm}^{3+}$ and $\mathrm{Sm}^{3+}$
- ✓$\mathrm{Ce}^{4+}$ and $\mathrm{Yb}^{2+}$
✓
Answer
Correct option: D.
$\mathrm{Ce}^{4+}$ and $\mathrm{Yb}^{2+}$
d
Magnetic moment $\mu=\sqrt{n(n+2)}$
Magnetic moment $\mu=\sqrt{n(n+2)}$
$\mathrm{n} \rightarrow$ number of unpaired electron
$Image$
Hence $\mathrm{Ce}^{4+}$ and $\mathrm{Yb}^{2+}$ are only diamagnetic.
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