Question

Which of the following is an example of a decomposition reaction? 1) H2 + O2 ----------→ H2O 2) MgO2 -------------→ Mg + O2 3) MgSO4 + 2NaCl ----------→ MgCl2 + Na2SO4 4) 2Na + Cl2 -----------→ 2NaCl

Answer 1

2) MgO ---→ Mg + O2

Step-by-step explanation:

Chemical decomposition is defined as the breakdown or breaking of a single molecule or entity into two or more smaller fragments.

Chemical decomposition is usually regarded as the exact opposite of chemical synthesis. In most cases, the chemical reaction in which two or more products are formed from a single reactant is called a decomposition reaction.