The correct order of acidic strength is:

\({\mathrm{Cl}}_{2}{\mathrm{O}}_{7}>{\mathrm{SO}}_{2}>{\mathrm{P}}_{4}{\mathrm{O}}_{10}\)

\({K}_{2}\mathrm{O}>\mathrm{CaO}>\mathrm{MgO}\)

\({\mathrm{CO}}_{2}>{\mathrm{N}}_{2}{\mathrm{O}}_{5}>{\mathrm{SO}}_{3}\)

\({\mathrm{Na}}_{2}\mathrm{O}>\mathrm{MgO}>{\mathrm{Al}}_{2}{\mathrm{O}}_{3}\)