Among \( \mathrm{Co}^{3+}, \mathrm{Ti}^{2+}, \mathrm{V}^{2+} \) and \( \mathrm{Cr}^{2+} \) ions,...

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Among \( \mathrm{Co}^{3+}, \mathrm{Ti}^{2+}, \mathrm{V}^{2+} \) and \( \mathrm{Cr}^{2+} \) ions, one if used as a reagent cannot liberate \( \mathrm{H}_{2} \) from dilute mineral acid solution, its spin-only magnetic moment in gaseous state is B.M.
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