Characteristics of chemical Reactions


 
 
Concept Explanation
 

Characteristics of Chemical Reactions

The important characteristics of chemical reactions are:

  • Evolution of a gas : When sodium reacts with water, bubbles of hydrogen gas is seen .
  • Formation of a precipitate.: When a silver nitrate solution reacts with sodium chloride solution it gives precipitate of silver chloride and sodium nitrate solution .
  • Change in colour.: When iron nail is dipped in blue colored copper sulphate solution ,the blue color change to green .
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    Sample Questions
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    Question : 1

    _______________ is a characteristics of chemical reaction .

    Right Option : A
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    Question : 2

    Which of the following are correct ?

    (a) When a silver nitrate solution reacts with sodium chloride solution it gives precipitate of silver chloride and sodium nitrate solution is an example of formation of precipitate.

    (b) When water is added to quick lime the vessel becomes warm due to evolution of heat is an example of change in temperature. .

    (c) When hydrogen gas react with oxygen gas it results in formation of liquid water is an example of change in state

    Right Option : D
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    Explanation
    Question : 3

    When hydrogen gas react with oxygen gas it results in formation of liquid water is an example of __________________.

    Right Option : B
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