Question

During the process to get clean water from muddy water, ____________ is performed after sedimentation, in which we pour the upper layer of the two immiscible liquids into a container.

• A. decantation
• B. filtration
• C. evaporation
• D. crystallization

Answer 1

The correct option is A decantation

The steps to get clean water from muddy water are as follows:
$Sedimentation\to \mathrm{Decantation}\to \mathrm{Filtration}$

1. So, first sedimentation is done, in which the heavy particles settle down at the bottom due to gravity and separate into two layers.(bottom layer of sand and upper layer of liquid containing very small particles of sand which do not settle down)
2. Next, the upper layer of liquid containing very small particles of sand suspended in it is poured or decanted in a container. This process is called decantation.
3. Now we need to separate these small particles of sand from the liquid to get clean water. This is done by using a filter paper having very small pores in it. When this liquid is passed through the filter paper, the sand particles are retained on it and what we get is clear water in the container. This process is called filtration.