Limitations of chemical Reaction


 
 
Concept Explanation
 

Limitations of Chemical Reaction

Limitations of chemical equations:

  • A chemical equation does not indicate the physical state of the reactants and the products, i.e., it does not say whether the substances involved in the reaction are solids, liquids or the gases.
  • It does not indicate whether heat is evolved or absorbed as a result of reaction i.e., it does not say whether reaction is exothermic or endothermic.
  • It does not indicate the conditions of the reaction, i.e., it gives no idea about the pressure, temperature,  concentration, presence of catalyst, etc, under which the reaction may occur.
  • It does not indicate whether the reaction is fast or slow.
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    Sample Questions
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    Question : 1

    Which of the following are the limitations of chemical equation ?

    Right Option : D
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    Question : 2

    Which of the following are correct :

    (a) A chemical equation does not indicate whether heat is evolved or absorbed as a result of reaction.

    (b) A chemical equation does not say whether reaction is exothermic or endothermic.

    Right Option : C
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    Explanation
    Question : 3

    Which of the following are correct :

    (a) A chemical equation does not say whether the substances involved in the reaction are solids, liquids or the gases.

    (b) A chemical equation gives no idea about the pressure, temperature,  concentration, presence of catalyst, etc, under which the reaction may occur.

    (c) A chemical equation does not say anything about the actual amount of the reactants consumed or products formed.

    Right Option : D
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    Explanation
     
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