Question

Cream is separated from the milk by which of the following:
a.) Centrifugation
b.) Condensation
c.) Chromatography
d.) Filtration

Answer 1

Hint: There is a difference in densities of the two components of the milk which is cream and skimmed milk. They are usually miscible in each other and none of them is solid. So a technique which is based on separation of two components of different densities can be used to separate milk from cream.

Complete step by step answer:
The process of centrifugation can be easily used to separate cream from milk. To carry out this the milk is rotated at a very high speed in a centrifuge. The cream being lighter floats over the heavier and skimmed milk. This happens because when the centrifuge machine is switched on, the milk is rotated or spun at a very high speed in its container and due to this the centrifugal force acts on the milk and this helps in separating the milk into cream and skimmed milk.The centrifuge works using the sedimentation principle, where the centrifugal acceleration causes denser substances and particles to move outward in the radial direction. At the same time, objects that are less dense are displaced and move to the center.
Hence, the correct answer is that Cream is separated from the milk by centrifugation.
So, the correct answer is “Option A”.

Note: Condensation is defined as the change of the physical state of matter from the gas phase into the liquid phase, and is the reverse of vaporization. The word most often refers to the water cycle.

Chromatography is defined as the laboratory technique for the separation of a mixture. In this technique the mixture is dissolved in a fluid called the mobile phase, which carries it through a fixed structure holding another material which is called the stationary phase.

Filtration is defined as a physical, biological or chemical operation that separates solid matter and fluid from a mixture with a filter medium that has a complex structure through which only the fluid can pass.