Total number of acidic oxides among $\mathrm{N}_2 \mathrm{O}_3, \mathrm{NO}_2, \mathrm{~N}_2 \mathrm{O}, \mathrm{Cl}_2 \mathrm{O}_7, \mathrm{SO}_2, \mathrm{CO}, \mathrm{CaO}, \mathrm{Na}_2 \mathrm{O}$ and NO is $\_\_\_\_$ .
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Solution
Acidic oxides are $\mathrm{N}_2 \mathrm{O}_3, \mathrm{NO}_2, \mathrm{Cl}_2 \mathrm{O}_7, \mathrm{SO}_2$
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