\( \mathrm{La}^{3+}, \mathrm{Ce}^{3+} \) तथा \( \mathrm{Gd}^{3+} \) आयनों का रंग कैसा होता है?
\( \mathrm{La}^{3+}, \mathrm{Ce}^{3+} \) तथा \( \mathrm{Gd}^{3+} \) आयनों का रंग कैसा होता है?
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