Question

Sometimes, foaming is seen in river water near the place where sewage water is poured after treatment.

If true enter 1 else 0.

• A. 1

Answer 1

The correct option is A 1
Sometimes, foaming is seen in river water near the place where sewage water is poured after treatment.
The foaming is due to surfactants which are present in sewage water. The hardness of sewage water decreases when it comes in contact with river water. Due to this foaming occurs.

The statement is true.
Answer-1