Question

C. Fill in the blanks.
1.
and
are two disinfectants used to purify water.
2. Water obtained from sedimentation tank after treatment is called
3. Biogas is a mixture of
and
4. Used
and
should not be thrown in the drain.​

Answer 1

Answer:

1. Chlorine and bleaching powder

2. Pure water

3. Methane

4. Plastic and bottles