Question

all non metal oxides are acidic in nature so why ammonium oxide is basic in nature if it is non metal please it is urgent​

Answer 1

most of the non metals donate electron so they are acidic in nature. but  to come in octate state ammonium gains electron so it is basic in nature..

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Answer 2

Non metallic oxide react with water and give acids.

CO2 +H2O H2CO3

when metallic oxide react with water it gives base.

MgO +H2O Mg(OH)2

so,non metallic oxides are acidic and metallic oxides are basic in nature.