Is NO2 amphoteric oxide?

Solution-

The answer is No.
NO₂ act as acidic oxides, due to the following reasons.
It reacts with alkali and bases to form salt and water. 
Dissolve in water to form acidic solutions.
Balance reaction can be seen as;
2NO₂ + 2OH^-  --> NO₂^- + NO₃^- + H₂O
2NO₂ + H₂O -->HNO₂ + HNO₃
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