Bases and Physical Properties of Bases


 
 
Concept Explanation
 

Bases and Physical Properties of Bases

Bases:

These are the substances usually the oxide or the hydroxide of a metal, which can react with an acid to produce salt and water.They are bitter in taste.Substances containing a base are called basic substances.e.g.:

Sodium ;hydroxide rightarrow NaOH 

Calcium ;hydroxide; rightarrow Ca(OH)_2

Properties of Base:

  • Bases are bitter in taste.
  • Solutions of bases are slippery to touch.
  • Bases may or may not be soluble in water. Bases that can dissolve in water are called alkalis. For example, Sodium hydroxide,    potassium hydroxide
  • Bases are strong and corrosive.
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    Sample Questions
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    Question : 1

    Which of the following are correct ?

    (a) Bases are usually the oxide or the hydroxide of a metal, which can react with an acid to produce salt and water.

    (b) The bases are bitter in taste.

     

    Right Option : C
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    Question : 2

    Some statements related to bases are given below

    1. Bases change the colour of the litmus red.
    2. Base may be soluble or insoluble.
    3. All bases are alkali, but all alkalies are not base.

    The correct statements are _______________

    Right Option : B
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    Explanation
    Question : 3

    large H_2SO_4 and large NH_4OH have which of the following similarties between themselves?

    Right Option : D
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    Explanation
     
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