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Solution:concept - If a compound is a complex in nature, it breaks down into simpler compounds, it is called a decomposition reaction.
As seen in the reaction, the lead nitrate ( ) is breaking down to form lead oxide, nitrogen dioxide, and oxygen.
In a combination reaction, two or more reactants combine to form a single product. Thus, the given reaction is not a combination reaction.
In a decomposition reaction, one reactant is decomposed (broken down) into two or more two products. This is what is happening in the given reaction, therefore, it is a decomposition reaction.
In a displacement reaction, one element of the compound is replaced by a similar type of element. Thus, the given reaction is not a displacement reaction.
Hence, the given reaction is a decomposition reaction. Thus, the correct option is (2).