Types of Mixtures


 
 
Concept Explanation
 

Types of Mixtures

A mixture is a substance which consist of two or more elements or compounds not chemically combined together.

Depending on nature of components, mixture can be of two types:

  • Homogeneous Mixture: It is a mixture in which the constituents are uniformly distributed, that is it has same composition throughout. E.g. salt dissolves in water to form a homogeneous mixture. Most homogeneous mixtures are called solutions like tea, coffee etc.
  • Heterogeneous Mixture: It is a mixture in which the constituents do not get mixed uniformly. E.g. sand and sawdust form a Heterogeneous mixture.
  • Types of Mixtures:

    Mixtures can be categorized into various types, depending on the physical states of the constituents. Some of these types are discussed here.

  • Solid - Solid mixture :  A mixture of sodium chloride (solid) and ammonium chloride (solid) and a mixture of sugar (solid) and sand (solid) are examples of solid—solid mixtures.

  • Solid - Liquid mixture : A mixture of common salt (solid) and water (liquid) is an example of a solid—liquid mixture. A mixture of iodine in ethanol (tincture of iodine) is also a solid—liquid mixture.
  • Solid - Gas mixture: Air entrapped in the pores of soil particles is an example of this type of mixture.
  • Liquid - Gas mixture : All gases are partially miscible with liquids. When a gas, such as hydrogen, oxygen or nitrogen is brought into contact with water, a small amount of the gas dissolves to form a mixture.
  • Gas - Gas mixture : All gases mix together, provided they do not react chemically. For example, hydrogen and oxygen gases mix together in all proportions. Air is a mixture of several gases.
  • Liquid - Liquid mixture : Examples of liquid—liquid mixtures are water—alcohol mixture and water-oil mixture.
  • Some Useful Mixtures :

  • Milk is not a pure substance. It is made of water, fat, proteins, etc.
  • Ink is a mixture made of water and one or more dyes.
  • Soft drinks (lemonade, soda water, etc.) that you see in your daily life are also not pure substances but are homogeneous mixtures.
  • Tincture of iodine which is used as an antiseptic is a mixture of iodine and ethanol.
  • Air is a mixture of oxygen, nitrogen, carbon dioxide, water vapour, etc.
  • An alloy is a homogeneous mixture, of a metal and other metal(s) or nonmetals. Brass is an alloy of copper and zinc. Gold has to be alloyed with silver and copper to make it hard enough for making jewelleries and ornaments.
  • Sample Questions
    (More Questions for each concept available in Login)
    Question : 1

    Which of the following are examples of mixture of solid and liquid:

    (1) Milk and water

    (2) Sugar Solution

    (3) Salt Solution

    (4) Soil and water solution.

    Right Option : C
    View Explanation
    Explanation
    Question : 2

    Which of the following is the example of solid-solid mixture ?

    Right Option : A
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    Explanation
    Question : 3

    Match the column I with column II and select the correct option from the codes given below :

    Column I Column II

    A.  A mixture having same composition

    and properties throughout.

    (p) Sediment

    B.  A mixture, different parts of

    which have different composition

    and properties.

    (q) Supernatant liquid

    C.  The solid that settles when a

    heterogeneous solid - liquid mixture

    is allowed to stand

    (r) Homogeneous mixture

    D.  The liquid above the solid settling

    from a heterogeneous solid-liquid

    mixture.

    (s) Heterogeneous mixture

     

    Right Option : C
    View Explanation
    Explanation
     
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