JEE MAIN - Chemistry (2024 - 30th January Morning Shift - No. 15)
Diamagnetic Lanthanoid ions are :
$$\mathrm{La}^{3+} \& \mathrm{~Ce}^{4+}$$
$$\mathrm{Nd}^{3+} \& \mathrm{~Ce}^{4+}$$
$$\mathrm{Lu}^{3+} \& \mathrm{~Eu}^{3+}$$
$$\mathrm{Nd}^{3+} \& \mathrm{~Eu}^{3+}$$
Explanation
$$\mathrm{Ce}:[\mathrm{Xe}] 4 \mathrm{f}^1 5 \mathrm{~d}^1 6 \mathrm{~s}^2 ; \mathrm{Ce}^{4+}$$ diamagnetic
$$\mathrm{La}:[\mathrm{Xe}] 4 \mathrm{f}^0 5 \mathrm{~d}^1 6 \mathrm{~s}^2 ; \mathrm{La}^{3+}$$ diamagnetic
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