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The correct order of acidic strength is :
\[
\begin{array}{l}
\mathrm{A} \mathrm{K}_{2} \mathrm{O}\mathrm{CaO}\mathrm{MgO} \\
\mathrm{B} \mathrm{CO}_{2}\mathrm{N}_{2} \mathrm{O}_{5}\mathrm{SO}_{3} \\
\mathrm{C} \mathrm{Na}_{2} \mathrm{O}\mathrm{MgO}_{2}\mathrm{Al}_{2} \mathrm{O}_{3} \\
\mathrm{D} \mathrm{Cl}_{2} \mathrm{O}_{7}\mathrm{SO}_{2}\mathrm{P}_{4} \mathrm{O}_{10}
\end{array}
\]
\( \mathrm{P} \)
W
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