Class 12 Chemistry P Block Elements Oxides of Nitrogen

Oxides of nitrogen

The nitrogen forms variety of oxides that are given below:

 

  • N2O (laughing gas ) oxidation state +1
  • NO oxidation state +2
  • N2O3 oxidation state +3
  • N2O4 oxidation state +4
  • N2O5 oxidation state +5(most acidic)
  1. N2O: nitrous oxide or laughing gas
  • In it the oxidation sate of nitrogen is +1.

Preparation:

  • It is prepared by heating ammonium nitrate that is:
  • NH4NO3  (on heating) --> N2O           + H2O
  • (Ammonium Nitrate)        Nitrous Oxide  Water
  • The laughing gas so formed is colourless, neutral and exist in gaseous state.
  • It structure is :

                    N- = N+ = O

                            Nitrous oxide

2. NO (nitric oxide )

  • In it the oxidation state of nitrogen is +2.

Preparation:

          Class_12_P_Block_Preparation_Of_Preparation_Of_Nitric_Oxide            

  • The NO formed is colorless and neutral gas.
  • The structure of nitric oxide is given below:

Class_12_P_Block_Preparation_Of_Structure_Of_Nitric_Oxide

     Nitric oxide

  1. N2O3 (nitrogen trioxide)
  • In it the oxidation state is +3.

 Preparation:

  • NO + N2O-->  N2O3
  • This nitrogen trioxide is blue solid and acidic in nature.
  • The structure of it is:

 

                              Class_12_P_Block_Preparation_Of_Structure_Of_Nitrogen_TriOxide

                                        Nitrogen trioxide

 

  1. NO2 (Nitrogen dioxide )
  • In it the oxidation state of N is +4.

Preparation:

           Pb(NO3)2 (ON heating)---> PbO    +    NO2     + O

         Lead Nitrate                       LeadOxide   Nitrogen dioxide

  • The nitrogen dioxide so formed is brown gas with acidic nature.
  • The structure of it is:

 Class_12_P_Block_Preparation_Of_Structure_Of_Nitrogen_dioxide

Nitrogen dioxide

 

This single electron system in it helps it in existing as dimer (N2O4).

2NO2        <--->       N2O4

Nitrogen dioxide        Dimer of Nitrogen dioxide

On cooling we get dimer and on heating dimer we get nitrogen dioxide.

 

  1. N2O5 (nitrogen pent oxide )
  • In it the oxidation state is +5.
  • This is most acidic among all oxides of nitrogen.

Preparation:

                Class_12_P_Block_Preparation_Of_Structure_Of_Preparation_of_Nitrogen_PentaOxide       

                     This nitrogen pent oxide is colorless gas with acidic nature.

  • The structure of this nitrogen pent oxide is given below:

 Class_12_P_Block_Preparation_Of_Structure_Of_Structure_of_Nitrogen_PentaOxide

                          Nitrogen pentaoxide

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