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Home/ Questions/Q 641
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Aahaana
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Aahaana
Asked: October 18, 20202020-10-18T08:58:43+00:00 2020-10-18T08:58:43+00:00In: Class 10

Why are decomposition reactions called the opposite of combination reactions? Write equations for these reactions.

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NCERT Solution for Class 10 Science Chapter 1
Chemical Reactions and Equations
Exercises Questions
Page No-15
Questions No-11

cbseclass10ncertscience
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    1. Baldev
      2021-02-01T15:35:30+00:00Added an answer on February 1, 2021 at 3:35 pm

      In decomposition reaction, a single reactant breaks down into two or more simpler product, while in combination reaction two or more reactant combine to form a single product. Therefore decomposition and combination reaction are opposite.

      Example of decomposition :

      (i)    2FeSO4(s)                    —Heat→    Fe2O3(s)      +    SO2(g)    +    SO3(g)
      Ferrous  sulphate                         Ferric oxide
      (ii)   CaCO3(s)    —Heat→    CaO(s)    +    Co2(g)
      Lime stone                  Quick lime

      Example of combination :

      (i)   CaO(s)    +    CO2(g)                 →      CaCO3(s)
      Quick lime     Carbon dioxide               Lime stone
      (ii)   Burning of coal →

      C(s)    +    O2(g)    →    CO2(g)

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    2. Anshita
      2021-02-04T08:55:54+00:00Added an answer on February 4, 2021 at 8:55 am

      In a combination reaction two or more substances are combined to form new substance while in the decomposition reaction one substance decomposes into two or more substances. Hence, the decomposition reactions are called opposite of combination reactions.

      Example of decomposition :

      (i)    2FeSO4(s)                    —Heat→    Fe2O3(s)      +    SO2(g)    +    SO3(g)

      Example of combination :

      (i)   CaO(s)    +    CO2(g)                 →      CaCO3(s)

       

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