$4N{H}_3$ $+$ $5O_2$ $\to$ $6H_{2}O$ $$ $+$ $4NO$

When one mole ammonia and one mole oxygen are taken:
1.  Oxygen is completely consumed
2.  Ammonia is completely consumed
3.  Both (1) and (2) are correct
4.  None of the above options is correct

In the Haber process, 30 litres of dihydrogen and 30 litres of dinitrogen were taken for the reaction which yielded only 50% of the expected product. What will be the composition of a gaseous mixture under the above condition in the end: