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Which one of the following series is arranged in order of increasing ionic radius?
(a) \( \mathrm{Mg}^{2+}\mathrm{S}^{2-}\mathrm{Cl}^{-}\mathrm{K}^{+}\mathrm{Ca}^{2+} \)
(b) \( \mathrm{Mg}^{2+}\mathrm{Ca}^{2+}\mathrm{K}^{+}\mathrm{Cl}^{-}\mathrm{S}^{2-} \)
(c) \( \mathrm{S}^{2-}\mathrm{Cl}^{-}\mathrm{K}^{+}\mathrm{Mg}^{2+}\mathrm{Ca}^{2+} \)
(d) \( \mathrm{S}^{2-}\mathrm{Mg}^{2+}\mathrm{Ca}^{2+}\mathrm{Cl}^{-}\mathrm{K}^{+} \)
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