Tag: process of separating components of a mixture

Questions Related to process of separating components of a mixture

Wheat flour can be separated from the wheat bran by:

chemistry mix and separate dry methods of separation process of separating components of a mixture method of separation

  1. hand picking

  2. sieving

  3. winnowing

  4. filtration

Show answer
Correct Option: B
Explanation:
Wheat flour can be separated from wheat bran by sieving. Bran is the hard outer layer of cereal grain.
Sieve analysis is a method of determining the particle size distribution of material. 
The process separates fine particles from more coarse particles by passing the material through a number of sieves of different mesh sizes.

Hence, option B is correct.

Winnowing is useful only when:

chemistry mix and separate dry methods of separation process of separating components of a mixture method of separation

  1. two solids have different melting points

  2. two solids have different boiling points

  3. two solids have different magnetic properties

  4. two solids have different weights

Show answer
Correct Option: D
Explanation:

winnowing is used to separated heavier and lighter components of a mixture by wind or by blowing air.This process is done by the farmers to separated lighter husk particles from heavier grain particles.

A mixture contains two solids A and B. Solid A is light in weight while solid B is very heavy. Their sizes are almost same. Here, A is the unwanted component. To get pure solid B, which separation method would you suggest?

chemistry mix and separate dry methods of separation process of separating components of a mixture method of separation

  1. Sieving

  2. Winnowing

  3. Magnetic separation

  4. Filtration

Show answer
Correct Option: B
Explanation:

Winnowing is a farming method developed by ancient people for separating grain from chaff. It is also used to remove weevils or other pests from stored grain. Threshing, which is the loosening of grain or seeds from the husks and straw, comes before winnowing. It is used for heterogeneous solid-solid mixtures.

Sieving can be used only when the components of the mixture have:

chemistry mix and separate dry methods of separation process of separating components of a mixture method of separation

  1. different sizes

  2. different melting points

  3. different boiling points

  4. different specific gravities

Show answer
Correct Option: A
Explanation:

Sieving can be used only when the components of the mixture are of different sizes.

The mixture of the component is added in the sieve. Sieve consists of large number of pores. The particle of small size get easily pass through these pores but the components with large particle size are not able to pass through these pores.
This way sieving separate components of a mixture of different sizes.

Hence, option D is correct.

Some iron fillings are mixed with sand. We can separate them using magnetic separation method. This method is applicable only when:

chemistry mix and separate dry methods of separation process of separating components of a mixture method of separation

  1. magnetic substances are mixed up with non-magnetic substances

  2. magnetic substances are mixed up with magnetic substances

  3. magnetic substances are heated beyond their Curie temperatures

  4. two magnetic substances have equal melting points

Show answer
Correct Option: A
Explanation:

In a mixture of two materials if one have magnetic properties then that material is easily separate by magnet because that material attracted by magnet and other material is not attracted by magnet. 

If both material have magnetic property or both haven't magnetic property then above method doesn't works.

Iron sulphide is not attracted towards magnet whereas its element is attracted towards magnet why?

chemistry mix and separate dry methods of separation process of separating components of a mixture method of separation

  1. Properties of compound are similar to the properties of its constituents

  2. Properties of compound are different to the properties of its constituents

  3. Compounds are made up of mixtures

  4. None of above

Show answer
Correct Option: B
Explanation:

Iron sulphide is not attracted towards magnet whereas its element (iron) is attracted towards magnet. This suggests that properties of compound are different to the properties of its constituents. In words, magnetic iron on chemical combination with sulphur, gives non magnetic iron sulphide.

Which of the following methods is most suitable for obtaining a pure, dry sample of sodium chloride from a mixture of solid sodium chloride and sand?

chemistry mix and separate dry methods of separation process of separating components of a mixture method of separation

  1. Shake the mixture with water, filter and dry the residue on the filter paper.

  2. Shake the mixture with water, filter and evaporate the filtrate.

  3. Heat the mixture gently and collect the substance which sublimes

  4. Heat the mixture gently and collect the substance which boils off

Show answer
Correct Option: B
Explanation:

To obtain dry sample of NaCl from sand, first we have to dissolve it in water;

then, NaCl gets dissolved into water and by filtration we can separate sand particles and after evaporation of water we get dry sample of NaCl.

A mixture of ____________ can be separated by magnetic attraction.

chemistry mix and separate dry methods of separation process of separating components of a mixture method of separation

  1. iron and steel

  2. copper and steel

  3. copper and tin

  4. sand and tn

Show answer
Correct Option: D
Explanation:
A mixture of sand and tin can be separated by magnetic attraction.
Sand is magnetic and tin is non magnetic. For the mixture to be separated by magnetic attraction, one component should be magnetic whereas remaining components should be non magnetic.

The process in which magnetically susceptible material is extracted from a mixture using a magnetic force is called:

chemistry mix and separate dry methods of separation process of separating components of a mixture method of separation

  1. ferromagnetic separation

  2. magnetic separation

  3. crystallisation

  4. diamagnetic separation

Show answer
Correct Option: B
Explanation:

Magnetic separation is a process in which magnetically susceptible material is extracted from a mixture using a magnetic force. This separation technique can be useful in mining iron as it is attracted to a magnet.

The essential condition for winnowing activity is:

chemistry mix and separate dry methods of separation process of separating components of a mixture method of separation

  1. water

  2. wind

  3. electricity

  4. machines

Show answer
Correct Option: B
Explanation:

Winnowing is a method of separation of chaff or husk from wheat/grains. Also called the process of separation of heavier components from lighter components by the application of wind.