Question

Which equation is a decomposition reaction?

a. Li2CO3 ---> Li2O + CO2

b. Zn + HCl ---> ZnCl2 + H2

c. Na2O + CO2 ---> Na2CO3

d. C6H12O6 + O2 ---> CO2 + H2O


please help asap

Answer 1

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

Answer 2

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.