Tag: process of separating components of a mixture

Questions Related to process of separating components of a mixture

Napthalene and iron filings can be separated by the method of

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

  1. Solvent extraction

  2. Sublimation

  3. Magnetic separation

  4. Filtration

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Correct Option: A,B,C
Explanation:

Napthalene can be dissolved in a solvent like benzene and filtered from iron filings. On evaporating the solution napthalene can be obtained back. This method is solvent extraction.
Iron filings can be attracted towards magnet and separated from napthalene. Therefore, method can be used magnetic separation.
Napthalene has the property of sublimation hence on heating napthalene sublimes and gets separated from iron filings by the method of sublimation.

A ferromagnetic substance becomes a permanent magnet when it is placed in a magnetic field because

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

  1. all the domains get oriented in the direction of magnetic field

  2. all the domains get oriented in the direction opposite to the direction of magnetic field

  3. domains get oriented randomly

  4. domains are not affected by magnetic field

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Correct Option: A

There are several criteria for purity of organic compounds. Out of these which one is considered best?

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

  1. Melting point

  2. Microscopic examination

  3. Mixed melting point

  4. Colour

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Correct Option: C
Explanation:

Mixed melting point is considered to be the best criteria for purity of a substance. The purified sample is mixed with a small quantity of pure compound and melting point of mixture is determined. If melting point of mixture is same as that of the pure compound, the sample compound is pure, otherwise it requires further purification.

Solvent extraction is a method for separating a substance from a solution or mixture by using a solvent in which it is more soluble. 

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

  1. True

  2. False

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Correct Option: A
Explanation:

Solvent extraction is a method used for separating a substance from one or more by using a solvent.

In most cases, the substance to be extracted, which may be a solid, a liquid or a gas, is dissolved in a liquid, along with other substances, and a liquid solvent is used for the extraction this is sometimes called liquid-liquid extraction. 

Name a technique used to separate :
Iron and sulphur

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

  1. filtration

  2. distillation

  3. magnetic

  4. chromatography

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Correct Option: C
Explanation:

Electrical and Magnetic separation: Electrolytes and non electrolytes, magnetic and non magnetic substances can be separated by this technique of separation using either electrical field or magnetic field.
Magnet can be used to separate iron from sulphur.

Threshing is a method of separation used to separate:

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

  1. two useful substances of the same size

  2. harmful substances from the useful ones

  3. the useful substance from the non-useful one

  4. None of these

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Correct Option: C
Explanation:

A farmer uses the method of threshing to separate the grain from the stalks. The stalks are beaten to separate the grain seeds.

Option (C) is correct.

A few coloured glass pieces that are big in size are mixed with sugar. The easiest way to separate them is:

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

  1. heat the mixture

  2. add the mixture to water

  3. hand pick the glass pieces

  4. handpick the sugar particles

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Correct Option: C
Explanation:

Since the size of glass particles is bigger than sugar, so we can easily get rid of those by hand picking.

A very large quantity of mixture contains tiny particles of three different substances X, Y, and Z. They are of the same size, cubical in shape and yellow in colour. X particles are very heavy, insoluble, non-magnetic and contribute 50% of the mixture. Y particles are very light, insoluble, non-magnetic and contribute 40% of the mixture. And Z particles are actually iron pieces. Which of the following methods can separate X, Y, and Z in the fastest manner?

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

  1. Winnowing - Magnetic separation

  2. Magnetic separation-Winnowing

  3. Sieving-Magnetic separation - Filtration

  4. Handpicking - Sublimation- Sieving

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Correct Option: B
Explanation:

By magnetic separation- It is used to remove particle Z because Z is iron.

Winnowing-it helps to separate the particle have different weight 
It will help to separate $XYZ$

Threshing is a method of separation used to separate:

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

  1. two useful substances of the same size

  2. harmful substances from the useful ones

  3. the useful substance from the non-useful one

  4. none of the above

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Correct Option: C
Explanation:

Threshing is the process of loosening the edible part of grain from the husks and straw to which it is attached. 

It is the step in grain preparation after reaping and before winnowing which separates the grain from the chaff.

Hence, option C is correct.

Winnowing is used for separation of:

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

  1. homogeneous solid-solid mixtures

  2. homogeneous solid-liquid mixtures

  3. heterogeneous solid-liquid mixtures

  4. heterogeneous solid-solid mixtures

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Correct Option: D
Explanation:

Winnowing is a farming method developed by ancient people for separating grain from the 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.