Requirement of Separation of Mixtures


 
 
Concept Explanation
 

Requirement of Separation of Mixtures

Requirement of Separation of Substances: Taking out useful substances from a mixture is usually the main reason for separation of substances. Sometimes, we also need to separate substances when we need to use different components in different ways.

  • To remove harmful substances: separation of insects from wheat, rice or pulses before using them.
  • To obtain useful constituents: crude petroleum is a mixture of various components such as petrol, diesel, kerosene and petroleum gas. We separate the components of petroleum to obtain useful components.
  • To remove undesirable substances: tea leaves are undesirable components and hence removed using a strainer.
  • Methods of separation: To separate a mixture we have to use such a property that one constituent of the mixture has and the others do not.

  • Separation of solid - soild mixture: The properties generally used to separate solids from the mixture of solids are colour, size, shape, weight, attraction by magnet or solubility in a liquid such as water.
  • Separation of solid - liquid mixture: The properties generally used to separate solids from the liquids are solubility, weight, size etc.
  • Separation of Liquid - Liquid mixture: The properties generally used to separate liquid from the liquids are solubility and boiling point.
  • Sample Questions
    (More Questions for each concept available in Login)
    Question : 1

    Which of the following are correct ?

    (a) Separation of substances is required to obtain useful constituents.

    (b) Separation can be done on the basis of solubility, weight, size etc., in solids.

    (c) Liquid liquid mixture separated on the basis of solubility and boiling point.

    (d) Sugar solution is a solid solid mixture.

    Right Option : C
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    Question : 2

    solid liquid mixture can be separated ______________.

    Right Option : C
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    Explanation
    Question : 3

    Why there is need to separate mixtures :

    (a) To remove harmful substances

    (b) To obtain useful constituents

    (c) To remove undesirable substances

     

    Right Option : D
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    Explanation
     
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