Answer: synthesis and decomposition
Explanation: Synthesis is a chemical reaction in which two or more than two reactants react together to form a single substance.
[tex]2Mg +O_2\rightarrow2MgO[/tex]
Decomposition is a chemical reaction in which a single reactant decomposes to give two or more than two products.
[tex]CaCO_3 \rightarrow CaO+CO_2[/tex]
Single displacement reaction is the one which a more reactive element displaces a less reactive element from a solution.
[tex]Zn +CuSO_4 \rightarrow ZnSO_4+Cu[/tex]
Double displacement reaction is the one which exchange of ions take place.
[tex]ZnCl_2 + CuSO_{4} \rightarrow CuCl_2 + ZnSO_4[/tex]
