Question

Which equation is a decomposition reaction?

Answer 1

Answer : (a) $Li_2CO_3\rightarrow Li_2O+CO_2$ is a decomposition reaction.

Explanation :

(a) $Li_2CO_3\rightarrow Li_2O+CO_2$ is a decomposition reaction.

• Decomposition reaction : It is a type of chemical reaction in which a single compound decomposes into two or more compounds.

(b) $Zn+2HCl\rightarrow ZnCl_2+H_2$ is a displacement reaction.

• Displacement reaction : It is a type of reaction in which a most reactive element displaces the least reactive element in a compound.

(c) $Na_2O+CO_2\rightarrow Na_2CO_3$ is a combination reaction.

• Combination reaction : It is a type of reaction where two or more compounds combine to form a single compound.

(d) $C_6H_{12}O_6+6O_2\rightarrow 6CO_2+6H_2O$ is a combustion reaction.

• Combustion reaction : It is a type of reaction where a hydrocarbon react with the oxygen to produced carbon dioxide and water.

Therefore, option (a) is a decomposition reaction.

Answer 2

The reaction in which reactant breaks down into more than one constituents is called decomposition reaction. So option A. Li2CO3 ---> Li2O + CO2  is correct.