Nitrates
Nitrites
Free ammonia
None of these
Answer is Right!
Answer is Wrong!
The correct answer is A. Nitrates.
Nitrates are the most oxidized form of nitrogen and are the end product of the nitrogen cycle. They are relatively stable and non-toxic, making them the preferred form of nitrogen for plants.
Nitrites are the intermediate form of nitrogen in the nitrogen cycle. They are less stable than nitrates and can be toxic to plants and animals.
Free ammonia is the least oxidized form of nitrogen. It is highly reactive and can be toxic to plants and animals.
Therefore, a well oxidized sewage will contain nitrogen mainly as nitrates.