Oxides of Nitrogen

Oxides of Nitrogen

Oxides of Nitrogen

Nitrous Oxide : N2O (Laughing gas)

Preparation
:

  1. By decomposition of ammonium nitrate

    NH4NO N2O + 2H2O

  2. By action of nitric acid with Zn

    4Zn + 10HNO3  4Zn(NO3)+ N2O + 5H2O

  3. By reduction of moist NO with SO2

    2NO + SO2 + H2 H2SO4 + N2O

    Structure: N  N  O

Properties:

  1. It is neutral oxide.
  2. C + 2N2 CO+ 2N2
  3. S + 2N2 SO+ 2N2
  4. 2P + 5N2 P2O+ 5N2
  5. Mg + N2 MgO + N2
  6. N2O + NaNH2  NaN3 + H2O

    N2O causes Euphoria

Nitric Oxide: NO

Preparation
:

  1. By action of HNO3 on Cu turnings

    3Cu + 8HNO3   3Cu(NO3)2 + 4H2O + 2NO

  2. By electrically heating N2 and O2

    N+O 2NO

  3. By heating mixture of sodium or potassium nitrate with FeSO4.

    2KNO3 + 5H2SO4 + 6FeSO4  2KHSO4 + 3Fe2(SO4)3 + 4H2O + 2NO.

  4. By Catalytic oxidation of NH3

    4NH3 + 5O 4NO + 6H2O

    Structure:

Properties:

  1. It is a colourless gas. It is a neutral oxide. It paramagnetic in gaseous state but diamagnetic in liquid and solid states. It is not the anhydride of any acid.

  2. 2NO  N2 + O2

  3. 2NO + X 2NOX [X = F, Cl or Br]

  4. CS2 + 2NO  CO+ 2S + N2

  5. FeSO+ NO  FeSO4.NO    (dark brown)

  6. 4Na + 2NO  2Na2O + N2

  7. 2Cu + 2NO  2CuO + N2

  8. 2NO + 2H2  N2 + 2H2O

  9. 2HNO3 + NO  3NO+ H2O

  10. 2NaOH + 4NO  2NaNO2 + N2O + H2O

  11. 4NO + H2 2HNO2 + N2O

Dinitrogen Trioxide: N2O3hf

Preparation:

  1. By condensing NO and NO2 together

    NO + NO N2O3

  2. By warming 50% HNO3 with As4O6

    As4O6 + 4HNO+ 4H2 4H3AsO+ 2N2O3

  3. By warming Cu with 50% HNO3

    2Cu + 6HNO3  2Cu (NO3) 2 + N2O3 + 3H2O

    Structure:  

Properties:

  1. Blue Liquid
  2. Acidic in nature
  3. Anhydride of HNO2

Nitrogen Dioxide: NO2

Preparation
:

  1. By heating nitrates of heavy metals

    2Pb(NO3)2  2PbO + 4NO+ O2

  2. By heating Cu with conc. HNO3

    Cu + 4HNO3  Cu (NO3)2 + 2NO+ 2H2O

    it exists in equilibrium with N2O4 and the equilibrium is temperature dependent.

    N2O  2NO2
    (Colourless)(Brown)

    In the solid state, the oxide consists of only N2O4 molecules and is colourless. As temperature increases solid melts to give yellow liquid. At 295 K, the liquid boils giving brown vapors of NO2. At 413 K, the dissociation is complete and the oxide consists of only NO2 molecules.

    Structure: 

Properties:

  1. Reddish brown gas.

  2. 2NO+ H2 HNO+ HNO3
    it is known as mixed anhydride of HNO2 and HNO3

  3. 2NaOH + 2NO2  NaNO2 + NaNO3 + H2O

  4. H2SO+ 2NO2  NO2.SO2(OH) + HNO3

  5. 2NO2 + 7H 2NH3 + 4H2O

  6. 2Na +2NO NaNO3 + NO

  7. 2P + 3NO P2O3 + 3NO

  8. S + 2NO2  SO2 + 2NO

  9. Fe + NO2  FeO + NO

  10. H2S + NO2  H2O + NO + S

Dinitrogen PentoxideN2O5

Preparation
:

  1. 4HNO+ P4O10  4HPO+ 2N2O5

  2. By reaction of AgNO3 with POCl3 or NO2Cl

    3AgNO3 + POCl Ag3PO4 + 3NO2Cl

    AgNO3 + NO2Cl  AgCl + N2O5

    Structure:

Properties:

  1. Colorless crystalline solid.

  2. 2N2O5  4NO2 + O2

  3. N2O5 + H2 2HNO3

  4. N2O5 + 2NaOH  2NaNO3 + H2O

  5. 5N2O+ l2  10NO2 + l2O5

  6. It is regarded as anhydride of nitric acid.

 

Oxides of nitrogen
Oxides Structure Preparation
(a) N2O  N  O NH4NO3    N2O + H2O
(b) NO2 2Pb(NO3)2   2PbO + 4NO2 + O2
(c) N2O3 NO + N2O2  N2O3
(d) N2O4 2NO N2O4
(e) N2O5 4HNO3 + P4O10  2N2O5 + 4H3PO4

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