Chemistry · Science General

Separation Techniques

842 Questions

Separation techniques involve physical methods to isolate mixtures, including distillation, filtration, and crystallization. Competitive exams frequently test these foundational concepts. Review the exact processes to enhance problem solving speed.

Distillation and evaporationCrystallization processFiltration methodsSeparating dissolved solidsChromatography and mass techniques

Separation Techniques Questions

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

State a method to separate ammonium chloride from a mixture of ammonium chloride and potassium chloride.

  1. Sedimentation

  2. Sublimation

  3. Magnetic separation

  4. Solvent extraction
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ammonium chloride sublimes on heating therefore it is easy to remove it by sublimation from a mixture of ammonium chloride and potassium chloride.

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

Which method can be used to separate two solid mixtures one of which dissolves in a particular solvent and other does not?

  1. Separating funnel

  2. Sublimation

  3. Magnetic separation

  4. Solvent extraction
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The two solid mixtures, one of which dissolves in a particular solvent and other does not, can be separated by solvent extraction method.

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

Iron and brass paper clips can be separated from each other by

  1. Magnetic separation

  2. Chromatography

  3. Centrifugation

  4. All of above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Magnetism is a form of separating mixtures which involves using a magnet to attract another magnetic object away from the substance it is in. Iron gets attracted towards magnet and are separated from brass.

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

The various methods for separation of solid-solid mixture includes:

  1. fractional distillation

  2. leaching

  3. magnetic separation

  4. centrifuge
Reveal answer Fill a bubble to check yourself
B,C Correct answer
Explanation

Fractional distillation is used to separate two liquid mixture based on difference in their boiling point.

centifuge is used to  separate solid from liquid,
Leaching and magnetic separation can be used to separate solid- solid mixture.

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


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 -

  1. Solid, solid, liquid.

  2. Solid, liquid, solid.

  3. All are liquids.

  4. All are solids.
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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?

  1. Sand, sawdust.

  2. Iron, sulphur.

  3. Iodine, sand.

  4. Gun powder and sawdust.
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

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 $XYZ$