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The basic character of the oxides \( \mathrm{MgO}, \mathrm{SrO}, \mathrm{K}_{2} \mathrm{O}, \mathrm{Cs}_{2} \mathrm{O} \) decreases in the order: (RPMT 2014)
(a) \( \mathrm{MgO}\mathrm{SrO}\mathrm{K}_{2} \mathrm{O}\mathrm{Cs}_{2} \mathrm{O} \)
(b) \( \mathrm{Cs}_{2} \mathrm{O}\mathrm{K}_{2} \mathrm{O}\mathrm{MgO}\mathrm{SrO} \)
\( \mathrm{P} \)
(c) \( \mathrm{Cs}_{2} \mathrm{O}\mathrm{K}_{2} \mathrm{O}\mathrm{SrO}\mathrm{MgO} \)
(d) \( \mathrm{K}_{2} \mathrm{O}\mathrm{MgO}\mathrm{SrO}\mathrm{Cs}_{2} \mathrm{O} \)
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