Question

Why are decomposition reactions called the opposite of combination reactions? give examples of each.​

Answer 1

Answer:

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

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Answer 2

Answer :

• In a decomposition reaction a single reactant breaks down into two or more simple and different products which can be either elements or compounds.

• On the other hand, In a combination reaction, two or more simple reactants which can be elements or compounds combine together to form a single product.

• Hence, we can say that a decomposition reaction is opposite of a combination reaction.

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Following are the examples of each reaction:-

Combination reaction:

• $\rm{2Mg(s)+O_2(g)\longrightarrow{}2MgO(s)}$

• $\rm{2CO(g)+O_2(g)\longrightarrow{}2CO_2(g)}$

Decomposition reaction:

• $\rm{PbCO_3(s)\xrightarrow{\text{heat}}PbO(s)+CO_2(g)}$

• $\rm{2FeSO_4(s)\xrightarrow{\text{heat}}Fe_2O_3(s)+SO_2(g)+SO_3(g)}$