Question

Review Problem 5.042 A pollutant in smog is nitrogen dioxide, NO2. The gas has a reddish brown color and is responsible for the red-brown color associated with this type of air pollution. Nitrogen dioxide is also a contributor to acid rain because when rain passes through air contaminated with NO2, it dissolves and undergoes the following reaction: 3NO2(g) + H20 - NO(g) + 2H+ (aq) + 2NO3- (aq). In this reaction, which element is reduced and which is oxidized? H is both reduced and oxidized. N is both reduced and oxidized. N is oxidized and His reduced. O is oxidized and His reduced. N is oxidized and O is reduced. O is oxidized and N is reduced. Which substance is the oxidizing agent and which is the reducing agent? NO2 is the oxidizing agent NO2 is the reducing agent H2O is the reducing agent H20 is the oxidizing agent H+ is the reducing agent H+ is the oxidizing agent NO is the reducing agent NO is the oxidizing agent NO3 is the reducing agent NO3 is the oxidizing agent

Answer 1

As the oxidation number of Nitrogen in NO2 is +4 . And in NO is +2 and in NO_{​​​​​3}^{​​​​-}​​​ is +5

So N is both oxidised and reduced

2) NO2 is oxidising agent and NO2 is reducing agent