Question

Which equation is a decomposition reaction?

Answer 1

Answer: $Li_2CO_3\rightarrow Li_2O+CO_2$

Explanation:

Decomposition is a type of chemical reaction in which one reactant gives two or more than two products.

$A\rightarrow B+C$

1. $Li_2CO_3\rightarrow Li_2O+CO_2$ is an example of decomposition.

2. $Zn+HCl\rightarrow ZnCl_2+H_2$ is an example of single replacement reaction in which more reactive element displaces the less reactive element from its salt solution.

3. $Na_2O+CO_2\rightarrow Na_2CO_3$ is an example of synthesis reaction in which two reactants are combining to form one product.

4. $C_6H_{12}O_6+O_2 \rightarrow CO_2+H_2O$ is an example of combustion in which fuel is reacted with oxygen to form carbon dioxide and water.

Answer 2

Decomposition means a reactant is broken down. Therefore, the Li2CO3 equation is the correct one.