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Q.

When lead nitrate is heated, it breaks down into lead monoxide, nitrogen dioxide and oxygen.
 

2Pb(NO3)22PbO+4NO2+O2

This reaction is an example of:

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a

Combination reaction

b

Displacement reaction 

c

Decomposition reaction

d

Double displacement reaction

answer is B.

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Detailed Solution

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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.

If a compound is complex in nature, it breaks down into simpler compounds, it is called a decomposition reaction.
As seen in the reaction, the lead nitrate ( Pb(NO 3 ) 2 ) is breaking down to form lead oxide, nitrogen dioxide, and oxygen.

Thus, the given reaction is a decomposition reaction.

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