Tag: separation of substances

Questions Related to separation of substances

Mixture can be separated, and kind of separation method depends on kind of:

chemistry separation of substances classification of mixtures mixtures: examples and properties types of solutions

  1. mixure it is

  2. solution it is

  3. molecule it is

  4. compound it is

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Correct Option: A
Explanation:

In chemistry, a mixture is a material system made up of two or more different substances which are mixed but are not combined chemically. A mixture refers to the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions, suspensions, and colloids.

The individual substances in a mixture can be separated using different methods, depending on the type of mixture. These methods include filtration, evaporation, distillation and chromatography.

A substance formed when two or more elements are mixed together without chemical reaction is known as:

chemistry separation of substances classification of mixtures mixtures: examples and properties types of solutions

  1. atom

  2. mixure

  3. molecule

  4. compound

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Correct Option: B
Explanation:

In chemistry, a mixture is a material system made up of two or more different substances which are mixed but are not combined chemically. A mixture refers to the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions, suspensions, and colloids.

When a gas dissolves in liquid, there is decrease in volume thus:
chemistry separation of substances classification of mixtures mixtures: examples and properties types of solutions

  1. increase of pressure will favour the dissolution of gas in liquid

  2. increase of pressure will not favour the dissolution of gas in liquid

  3. increase of pressure has no affect on the dissolution of gas in liquid

  4. increase of temperature will favour the dissolution of gas in liquid

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Correct Option: A
Explanation:
When a gas dissolves in liquid, there is decrease in volume thus increase of pressure will favour the dissolution of gas in liquid. Initially total volume decreases, the pressure decreases. Now when pressure is increased, the system will shift in a direction that will decrease the pressure to nullify the effect of increase in pressure. This is through the dissolution of gas in liquid. This is similar to Le-chatellier's principle for chemical equilibrium.
Note:
Decrease of temperature will favour the dissolution of gas in liquid.

We need to separate different components of the mixture:

chemistry separation of substances classification of mixtures mixtures: examples and properties types of solutions

  1. to obtain pure substance

  2. to separate components for further uses

  3. to remove the impurities

  4. all of these

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Correct Option: D
Explanation:

Separation of a mixture is done in order to:-

(i) remove impurities.
(ii) get pure substance.
(iii) separate the components of mixture.

Two immiscible liquids can be separated by using: 

chemistry separation of substances classification of mixtures mixtures: examples and properties types of solutions

  1. evaporation disc

  2. separating funnel

  3. filter funnel

  4. can not be separated

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Correct Option: B

Substances are separated, because the :

chemistry separation of substances classification of mixtures mixtures: examples and properties types of solutions

  1. harmful substance can be removed

  2. non-useful substance can be removed

  3. useful substance, which we require separately

  4. All of these

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Correct Option: D
Explanation:

Separation of a mixture is done in order to :


(i) remove impurities or harmful substances.


(ii) to get pure substance.

(iii) to separate the components of the mixture and get the useful substance which is required, separately.


Hence the option D is correct.

Seawater can be separated in order to obtain pure substances like salt and water.

chemistry separation of substances classification of mixtures mixtures: examples and properties types of solutions

  1. True

  2. False

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Correct Option: A
Explanation:

It is possible to separate seawater to obtain pure substances like salt and waters. For this various physical and chemical processes are used.

Crude oil can be separated into petrol, diesel, kerosene, wax, etc.

chemistry separation of substances classification of mixtures mixtures: examples and properties types of solutions

  1. True

  2. False

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Correct Option: A
Explanation:

The crude oil can be separated into various substances like petrol, diesel, kerosene, wax, etc. These are very useful in supplying energy and in various processes.