Question

NO2 is a double acid anhydrate.
explain

Answer 1

For one simple reason - when it reacts with water (i.e hydrolyses), both nitrous and nitric acids are produced:

2 NO2 + H2O → HNO2 + HNO3

Nitrous acid isn’t very stable in solution and will disproportionate if the solution becomes warm/hot or concentrated, but if kept cold & relatively dilute both acids will form.

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Answer 2

Hey mate here is your answer

Mixed anhydride or double acid anhydride is the compound that react with water to form a mixture of two acidic anhydride .NO2 is called mixed anhydride because because it reacts with water to from the following mixture

2NO2 + H20--- HNO2 + HNO3

Hope it helped you :)