Arrange the following: \( \mathrm{Mg}^{2+}, \mathrm{Sr}^{2+}, \mathrm{Be}^{2+}, \mathrm{Ca}^{2+}...

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Arrange the following:
\( \mathrm{Mg}^{2+}, \mathrm{Sr}^{2+}, \mathrm{Be}^{2+}, \mathrm{Ca}^{2+} \) and \( \mathrm{Ba}^{2+} \) ions in the increasing order of their heats of hydration.
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