Question

Which of the following is an application of centrifugation?
A.Pathological test of blood and urine
B.Preparing lactic cultures
C.Washing machine
D.All of above

Answer 1

Centrifugation is a method used to separate substances on the basis of the densities of particles. It can also be used to separate very small solid particles from a liquid solution.

Complete step by step solution:
We know that a material is made up of different compounds by their physical combination in the form of either of the solutions, colloids or suspensions. The individual components of the mixture are not in a definite chemical ratio, do not chemically react and each component of the mixture has their own physical properties. Since they are not chemically combined, the constituents of a mixture can be separated by physical methods of separation, namely chromatography, centrifugation, distillation, etc.
Centrifugation is a technique of physical separation that is used to separate small solid particles from a liquid by continuous stirring at high speed. As the centrifugal and centripetal forces begin to act on the particles, the heavier and lighter components are separated. The heavier particles face a higher centrifugal force and are thus pushed outwards and are then obtained at the bottom of the mixture.
In pathological tests of blood and urine, the various components are separated by centrifugation which makes the testing easier.
It is also used to separate skimmed milk from whole milk to prepare lactic cultures.
In washing machines, the clothes are spun at high speed to squeeze out water from clothes.
Thus, all the options are correct.

The correct option is D.

Note: We know that mixtures can be either homogeneous or heterogeneous. Centrifugation can only be used to separate heterogeneous mixtures as it depends on the difference in the size of components. It is also used in the separation of butter from milk.