Answer :

A = NH4NO2

B = N2

C= NH3


On heating compound A gives compound B

N2 is a constituent of air

NH4NO2 N2 + 2H2O

When N2 is treated with 3mol of hydrogen in the presence of catalyst gives another gas (c)

N2 + 3H2 2NH3

The gas C is basic in nature due to presence of lone pair on nitrogen atom .

Gas C on further oxidation in moist condition gives compound D (HNO3)

HNO3 is present in acid rain.

4NH3 + 5O24NO + 6H2O

2NO + O22NO2

3NO2 + H2O 2HNO3 + NO

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