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

    How can we separate solid solid mixture ?

     

    Right Option : D
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    Explanation
    Question : 2

    Crude petroleum is a mixture of which of the following components :

    (a) Petrol

    (b) diesal

    (c) kerosene

    (d) petroleum gas

    Right Option : D
    View Explanation
    Explanation
    Question : 3

    Which of the following is not a separation technique ?

    Right Option : C
    View Explanation
    Explanation
     
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