Answer:
1 volume of NO
Explanation:
First let us generate a balanced equation for the reaction between NH3 and O2 to produce NO and water. This is shown below:
4NH3 + 5O2 —> 4NO + 6H2O
From the equation,
4 volumes of NH3 produced 4 volumes of NO.
Therefore, 1 volume of NH3 will also produce 1 volume of NO