Question

When lead nitrate is heated, it breaks down into lead monoxide, nitrogen dioxide, and oxygen.
$2Pb{ ({ NO }_{ 3 }) }_{ 2 }\quad \rightarrow\quad 2PbO+{ 4NO }_{ 2 }+{ O }_{ 2 }$

The reaction is an example of:
A. Combination reaction
B. Decomposition reaction
C. Double decomposition reaction
D. Displacement reaction

Answer 1

Hint: As you can see this reaction is a type of chemical reaction in which a single compound is breaking down into two or more new compounds.

Complete step by step answer:

We can use the elimination method to solve this type of question
Combination reaction - A combination reaction (also known as a synthesis reaction) is a reaction where two or more elements or compounds (reactants) combine to form a single compound (product).

X + Y $\rightarrow$ Z

Decomposition reaction - Chemical decomposition is the process or effect of simplifying a single chemical entity into two or more fragments. Chemical decomposition is usually regarded and defined as the exact opposite of chemical synthesis.

Z $\rightarrow$ A + B

Double decomposition reaction - Reaction in which two compounds in their aqueous solution react to form two new products by interchanging their radicals or ions is called a double decomposition reaction or double displacement reaction.

A-X + B-Y $\rightarrow$ A-Y + B-X

Displacement reaction - Displacement reaction is a chemical reaction in which a more reactive element displaces a less reactive element from its compound. Both metals and nonmetals take part in displacement reactions.

A-B + C $\rightarrow$ A + B-C

By looking at all above definitions of reactions, we can conclude that when we heat lead nitrate, it decomposes into PbO , ${ NO }_{ 2 }$ and ${ O }_{ 2 }$ . Hence it is a Decomposition reaction.

So the correct answer is option B.

Note: Here lead(II) nitrate undergoes a decomposition reaction to give yellow coloured lead (II) oxide, colourless gas of oxygen and brown colour nitrogen dioxide.