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Test: Separation of Substances - UPSC MCQ


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10 Questions MCQ Test Science & Technology for UPSC CSE - Test: Separation of Substances

Test: Separation of Substances for UPSC 2024 is part of Science & Technology for UPSC CSE preparation. The Test: Separation of Substances questions and answers have been prepared according to the UPSC exam syllabus.The Test: Separation of Substances MCQs are made for UPSC 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Separation of Substances below.
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Test: Separation of Substances - Question 1

Identify the method of separation in the image:

Methods of Separating Mixtures: Hand-Picking, Threshing, Winnowing,  Distillation & Filtration

Detailed Solution for Test: Separation of Substances - Question 1

The method of separation used to separate stone from rice is handpicking.
 

Test: Separation of Substances - Question 2

The separation of grains from husk is done by the process of:

Detailed Solution for Test: Separation of Substances - Question 2
  • Winnowing is the method in which heavier components of the mixture are separated from the lighter substances with the help of wind.
  • This method is used for separating grains from husk after the process of threshing.
Test: Separation of Substances - Question 3

A mixture of chalk and water can be separated by:

FILTRATION OF CHALK -WATER AIM To separate a chalk water mixture by  filtration. Background If your solid does

Detailed Solution for Test: Separation of Substances - Question 3
  • Chalk powder is a carbonate compound, insoluble in water.
  • Because of this property of chalk powder, it is easy to separate it from water.
  • The mixture containing chalk powder and water is allowed to get filtered.
  • (Filter paper can be used for filtration) After filtration, the retentate obtained is chalk and the filtrate obtained is water without chalk.
  • The retentate is allowed to get dried and hence, chalk is obtained in powder form.
Test: Separation of Substances - Question 4

Mixtures need to be separated because

Detailed Solution for Test: Separation of Substances - Question 4


Why do mixtures need to be separated?

  • To remove undesirable substances: Separating mixtures allows for the removal of unwanted or harmful substances that may be present in the mixture.

  • To get desirable substances: Separation of mixtures enables the extraction of specific components that are desired for a particular purpose or application.

  • To obtain highly pure substances: By separating mixtures, it is possible to isolate and purify substances to achieve a high level of purity.


Therefore, mixtures need to be separated for various reasons including removing undesirable substances, obtaining desirable substances, and obtaining highly pure substances.



Test: Separation of Substances - Question 5

The properties used to separate two solids from a mixture by winnowing is ______.

Mo Odisha - • WINNOWING is a farming method developed by ancient people for  separating grain from chaff. It is also used to remove weevils or other  pests from stored grain. Threshing,

Detailed Solution for Test: Separation of Substances - Question 5
  • Difference in weight is the properties used to separate two solids from a mixture by winnowing.
  • Husk or dirt particles can be separated by winnowing method. It is used to separate the heavier and lighter components of a mixture by wind or by blowing air.
  • In this method, the mixture of husk and seeds of grain are take in plate and are made to fall down from a height up to our shoulders.
Test: Separation of Substances - Question 6

Most of the substances that we see around us are:

What is a Mixture? - Definition, Properties, Examples & Types with Videos

Detailed Solution for Test: Separation of Substances - Question 6

Most of the substances that we see around us are a mixture of two or more substances.

Test: Separation of Substances - Question 7

Which of the following dissolve in water?

Detailed Solution for Test: Separation of Substances - Question 7

Solids, liquids and gases all dissolves in water depending upon the type of the solute.

Test: Separation of Substances - Question 8

A mesh which is used to separate things on the basis of their difference in size

Sieving : Tigtag

Test: Separation of Substances - Question 9

The process by which the unwanted solid particles are removed from the liquid is called:

Detailed Solution for Test: Separation of Substances - Question 9

The process by which the unwanted solid particles are removed from the liquid is called as filtration.

Test: Separation of Substances - Question 10

Which of the following mixtures cannot be separated by using water as solvent followed by filtration and evaporation?

Detailed Solution for Test: Separation of Substances - Question 10
Explanation:

  • Sand and sulphur: This mixture can be separated by using water as a solvent followed by filtration and evaporation. Sulphur is soluble in carbon disulphide, but insoluble in water. Sand is insoluble in water. Therefore, after adding water to the mixture, sulphur will dissolve in carbon disulphide, leaving sand behind which can be separated by filtration.

  • Salt and chalk powder: Salt is soluble in water, whereas chalk powder is insoluble. So, after adding water to the mixture, salt will dissolve, and chalk powder can be separated by filtration.

  • Sand and sugar: Sugar is soluble in water, while sand is insoluble. After adding water to the mixture, sugar will dissolve, and sand can be separated by filtration.

  • Blue vitriol and sand: Blue vitriol (copper sulfate) is soluble in water, while sand is insoluble. So, after adding water to the mixture, blue vitriol will dissolve, and sand can be separated by filtration.


Therefore, the mixture that cannot be separated by using water as a solvent followed by filtration and evaporation is sand and sulphur.

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