How many of the following oxides are acidic: $\mathrm{CO}{}_2$, $\mathrm{Al}{}_2\mathrm{O}{}_3$, $\mathrm{N}{}_2\mathrm{O}{}_5$, $\mathrm{CaO}$, $\mathrm{NO}$, $\mathrm{Cl}{}_2\mathrm{O}{}_7$?

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