Given below are the oxides:
$\mathrm{Na}_2 \mathrm{O}, \mathrm{As}_2 \mathrm{O}_3, \mathrm{~N}_2 \mathrm{O}, \mathrm{NO}$ and $\mathrm{Cl}_2 \mathrm{O}_7$
Number of amphoteric oxides is:
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