Question

Which of the following represents a decomposition reaction?

A. $A + B \rightarrow AB$
B. $A + B \rightarrow B + C$
C. $AB \rightarrow A + B$
D. $A + B + C \rightarrow X + Y$

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Answer


The correct option is C: $AB \rightarrow A + B$

In a decomposition reaction, a single compound breaks down into two or more simpler substances. For instance, silver chloride ($ \mathrm{AgCl} $) decomposes into silver ($ \mathrm{Ag} $) and chlorine ($ \mathrm{Cl}_2 $) when exposed to sunlight. The reaction can be represented as: $$ 2 \mathrm{AgCl}(\mathrm{s}) \xrightarrow{\text {Sunlight}} 2 \mathrm{Ag}(\mathrm{s}) + \mathrm{Cl}_2(\mathrm{g}) $$

Therefore, the general representation of a decomposition reaction is: $$ AB \rightarrow A + B $$


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