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 the substances usually the oxide or the hydroxide of a metal

    (b) Bases that can dissolve in water are called alkalis. like, Sodium hydroxide.

    (c) Bases turn colourless phenophthalein to pink and orange coloured methyl orange indicator to yellow.

    Right Option : D
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    Question : 2

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

    Right Option : B
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    Question : 3

    Which of the following are correct :

    (a) When metals burn in oxygen the respective metallic oxides are formed.

    (b) When calcium burn in oxygen the calcium oxide is formed.

    (c) The Potassium oxide when dissolved in water gives Potassium hydroxide.

    Right Option : D
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