SELECT * FROM question_mgmt as q WHERE id=3501 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=9 AND subId=16 AND chapterId=252 and ex_no='4' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 10th science Chemical reaction and Equation why are decomposition reactions called the opposit

Question:

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

Answer:

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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