Choose whether the given statement is true/false:

During the decomposition reaction, a single substance decomposes and forms two or many substances, whereas, in combination reaction, two or more reactants combine and form a single substance.

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True

False

answer is A.

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Detailed Solution

The given statement is true.
Concept- Decomposition and combination reactions are two different types of chemical reactions.
In a combination reaction, two molecules combine together into one. This combination reaction is generally an exothermic reaction. It can be written as;

Examples for combination reaction include coal combustion;

In a decomposition or dissociation reaction, one molecule decomposes into two. To break into two, a bond dissociation energy is needed. This energy can be supplied in the form of heat or current. Thus decomposition is an endothermic reaction. It can be written as;

Examples of decomposition reaction is thermal decomposition of calcium carbonate;

Thus the decomposition process is called the opposite of the combination process.
Therefore, the given statement is true.
Hence, the correct option is (1).

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