Paramagnetic and coloured ions are : (a) \( \mathrm{Ce}^{4+}, \mathrm{Yb}^{2+} \) (b) \( \mathrm...

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Paramagnetic and coloured ions are :
(a) \( \mathrm{Ce}^{4+}, \mathrm{Yb}^{2+} \)
(b) \( \mathrm{Gd}^{3+}, \mathrm{Nd}^{3+} \)
(c) \( \mathrm{La}^{3+}, \mathrm{Lu}^{3+} \)
(d) \( \mathrm{Lr}^{3+}, \mathrm{Lu}^{3+} \)
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