Question

Ravi collected the sample of river water. He wanted to quicken the process of sedimentation. Which of the following must be added to the samples ?
1.Orzonisation
2.Adding chlorine tables
3.Adding potash alum
4.Any one of the above steps will quicken sedimentation​

Answer 1

Answer:

opt 3: adding potash alum

Explanation:

alum helps in sedimentation, this is because alum is an external agent. this will lead to particles in river water to coagulate and form heavier particles. hence these heavy particles will easily sink.