Compounds of Nitrogen

Oxides of Nitrogen

Nitrous Oxide (N2O)

It is used for the preparation of azides

N2O + NaNH2 —> NaN3 + H2O

Nitric oxide (NO)

The liquid and solid states are diamagnetic, becuause close dimers are formed

Reaction with Cl2

2NO + Cl2 —> 2NOCl

(nitrosyl chloride)

Nitrogen oxide

The gas condenses to a brown liquid which turns paler on cooling and eventually becomes a colourless solid, due to dimerization.

2NO2 <—> N2O4

Liquid N2O4 is useful as a non – aqueous solvent. It self – ionizes as

N2O4 NO+ + NO3-
acid base

A typical acid base reaction is

NOCl + NH4NO3 —> NH4Cl + N2O4

Acid base salt solvent

Nitrogen trioxide or nitrogen sesquioxide (N2O3)


N2O3 + H2O —> 2HNO2

(anhydride of nitrous acid)

N2O3 + 2HClO4 —> 2NO [ClO4] + H2O

Di nitrogen pentoxide [N2O5]

It is the anhydride of HNO3. It is a strong oxidizing agent

Oxy Acids of Nitrogen

1. H2N2O2 Hyponitrous acid

2. H2 NO2 Hydronitrous acid

3. HNO2 Nitrous acid

4. HNO3 Nitric acid

5. HNO4 Per nitric acid

Illustration : If starting reagents are elements, what sequence of reactions leads to N2O?

Solution: On passing air through an electric arc, first nitric oxide, NO is formed

N2 + O2 —> 2NO

When nitric oxide is allowed to come in contact with moist iron fillings, nitrous oxide. N2O is formed.

2NO + H2O + Fe —> N2O + Fe(OH)2

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