Tag: mix and separate

Questions Related to mix and separate

Identify the methods which are used for separation.

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

  1. Handpicking

  2. Threshing

  3. Winnowing

  4. All of the above

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Correct Option: D
Explanation:

Handpicking, winnowing, sieving, sedimentation, decantation and filtration are some of the methods of separating substances from their mixtures. 

 Sieving allows the fine particles to pass through the holes of the sieve while the bigger flour particles remain in the sieve.

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:

 Sieving allows the fine flour particles to pass through the holes of the sieve while the bigger impurities remain in the sieve.


There is a mixture of X, Y and Z. If the mixture of X and Y can be separated by magnetic separation and the mixture of Y and Z can be separated by distillation.
The different states of X, Y and Z are respectively -

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

  1. Solid, solid, liquid.

  2. Solid, liquid, solid.

  3. All are liquids.

  4. All are solids.

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Correct Option: A
Explanation:

Since X, Y can be separated by magnetic separation so X, Y are solids. 

Y, Z can be separated by distillation method therefore, Y, Z must be solid liquid mixture. 
Already we know Y is a solid hence, Z is a liquid.

Hence, option (A) is the correct answer.

In a mixture of X and Y, X can be separated from Y by magnetic separation.

Which of the following pairs will form X and Y?

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

  1. Sand, sawdust.

  2. Iron, sulphur.

  3. Iodine, sand.

  4. Gun powder and sawdust.

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Correct Option: B
Explanation:

X, Y are two solids making a mixture. 

One is component is magnetic, whereas, other is non-magnetic. 
Hence, the mixture must be of iron and sulphur.

Therefore, option (B) will be the correct answer.

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.