Question

Which type of chemical reaction is represented by the equation
$4Al(s)$ + $3{O_2}$ $(g)$ $\to$ $2A{l_2}{O_3}$ $(s)$

Answer 1

The synthesis process and the decomposition reaction are two different types of reactions. A single product is always produced in a synthesis reaction. We can get a breakdown reaction by reversing a synthesis reaction. This type of reaction is also known as "chemical decomposition reaction".

Complete answer:
This is a decomposition reaction illustration. When one reactant breaks down into two or simpler compounds, the reaction is called a decomposition reaction. The generic equation for the decomposition reaction may be found here
$AB$ $\to$ $A$ + $B$
The majority of decomposition reactions necessitate an energy input in the form of heat, light, or electricity. The decomposition reaction is defined as the process by which a single material decomposes into many substances. A major feature of a decomposition reaction is that one substance serves as a reactant, resulting in the formation of many products.
In this type of reaction like $4Al(s)$ + $3{O_2}$ $(g)$ $\to$ $2A{l_2}{O_3}$ $(s)$ , Aluminium is oxidized to aluminum oxide by oxygen. As a result, when aluminum undergoes oxidation, it functions as a reducing agent, and when oxygen undergoes reduction, it acts as an oxidizing agent.

Note:
All decomposition reactions tear down the bonds that keep it together to produce simpler basic parts, they all require some type of energy in variable degrees. The majority of these reactions are known to be endothermic as a result of this fundamental law, while exceptions do exist. The act or effect of breaking down a single chemical entity into two or more fragments is known as chemical decomposition or chemical breakdown. In simple terms, a decomposition reaction is a chemical reaction that produces two or more products from a single source.