Tag: process of separating components of a mixture

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

Napthalene and iron filings can be separated by the method of

  1. Solvent extraction

  2. Sublimation

  3. Magnetic separation

  4. Filtration
Reveal answer Fill a bubble to check yourself
A,B,C Correct answer
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.

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

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

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Ferromagnetic materials contain magnetic domains. When placed in an external magnetic field, these domains align with the field, resulting in a net magnetic moment and permanent magnetization.

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

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

  1. Melting point

  2. Microscopic examination

  3. Mixed melting point

  4. Colour
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

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

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
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. 

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

Name a technique used to separate :
Iron and sulphur

  1. filtration

  2. distillation

  3. magnetic

  4. chromatography
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

Threshing is a method of separation used to separate:

  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
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

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

  1. heat the mixture

  2. add the mixture to water

  3. hand pick the glass pieces

  4. handpick the sugar particles
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

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

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

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?

  1. Winnowing - Magnetic separation

  2. Magnetic separation-Winnowing

  3. Sieving-Magnetic separation - Filtration

  4. Handpicking - Sublimation- Sieving
Reveal answer Fill a bubble to check yourself
B Correct answer
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 $XYZ$

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

Threshing is a method of separation used to separate:

  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
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

Winnowing is used for separation of:

  1. homogeneous solid-solid mixtures

  2. homogeneous solid-liquid mixtures

  3. heterogeneous solid-liquid mixtures

  4. heterogeneous solid-solid mixtures
Reveal answer Fill a bubble to check yourself
D Correct answer
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.