In the form of which compound is nitrogen released during the oxidation of nitrogen-containing organic compounds?

In the form of which compound is nitrogen released during the oxidation of nitrogen-containing organic compounds? Write the reaction equation for the combustion of ammonia.

During the oxidation of nitrogen-containing organic compounds, nitrogen is released in the form of molecular nitrogen N2.
Combustion of ammonia: 4NH3 + 3O2 -> 2N2 + 6H2O

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