Answer: d. a new compound is formed.
Explanation:
1. Decomposition is a type of chemical reaction in which one reactant gives two or more than two products.
Example: [tex]Li_2CO_3\rightarrow Li_2O+CO_2[/tex]
2. Electrolytic decomposition is a type of chemical reaction in which one reactant gives two or more than two products. on passing electric current.
Example: [tex]H_2O\rightarrow H_2+\frac{1}{2}O_2[/tex]
3. Combustion is a type of chemical reaction in which fuel is reacted with oxygen to form carbon dioxide and water.
Example:
[tex]C_6H_{12}O_6+O_2 \rightarrow CO_2+H_2O[/tex]
4. Synthesis reaction is a chemical reaction in which two reactants are combining to form one product.
Example: [tex]Li_2O+CO_2\rightarrow Li_2CO_3[/tex]
