In the concept of self purification of natural streams, complete the following phrase. Solution to pollution is _____

What is the minimum amount of DO required for the life survival of aquatic animals?

What is the rate of a chemical reaction not dependent on?

The impact of pollution depends upon nature of the pollutants and the _______

Flowing water bodies recover rapidly.

Oxygen in water is consumed during aerobic biodegradation of organic compounds.

In case of aqueous solution which of the following mathematical formula holds good?

2NH3 +3O2 -> 2NO2– + ___ + 2H2O.