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The charge/size ratio of a cation determines its
P polarizing power. Which one of the following

W sequences represents the increasing order of the polarizing power of the cationic species, \( \mathrm{K}^{+} \), \( \mathrm{Ca}^{2+}, \mathrm{Mg}^{2+}, \mathrm{Be}^{2+} \) ?
(1) \( \mathrm{Ca}^{2+}\mathrm{Mg}^{2+}\mathrm{Be}^{+2}\mathrm{K}^{+} \)
(2) \( \mathrm{Mg}^{2+}\mathrm{Be}^{2+}\mathrm{K}^{+}\mathrm{Ca}^{2+} \)
(3) \( \mathrm{Be}^{2+}\mathrm{K}^{+}\mathrm{Ca}^{2+}\mathrm{Mg}^{2+} \)
(4) \( \mathrm{K}^{+}\mathrm{Ca}^{2+}\mathrm{Mg}^{2+}\mathrm{Be}^{2+} \)
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