Question

The given reaction is an example of:
\[F{{e}_{2}}{{O}_{3}}+2Al\to A{{l}_{2}}{{O}_{3}}+2Fe\]
(A) combination reaction
(B) double displacement reaction
(C) decomposition reaction
(D) displacement reaction

Answer 1

Hint: Combination reaction is also known as a synthesis reaction. A decomposition reaction is just the opposite of a combination reaction. Displacement reaction is also called a substitution reaction.Double displacement reaction is also called a metathesis reaction.

Complete step by step solution:
A chemical reaction is a process that leads to the chemical transformation of one set of chemical substances to another.
The four basic chemical reactions are: synthesis, decomposition, single replacement and double replacement.
Given reaction is as follows:
\[F{{e}_{2}}{{O}_{3}}+2Al\to A{{l}_{2}}{{O}_{3}}+2Fe\]
Here, we can see that oxygen is displaced from iron to aluminium. Therefore, it is a displacement reaction.
We will discuss the rest of the types of reactions.
A combination reaction (also known as a synthesis reaction) is a reaction where two or more elements or compounds (reactants) combine to form a single compound (product). Such reactions are represented by equations of the following form:
\[X\text{ }+\text{ }Y\text{ }\to \text{ }XY.\]
Those reactions in which two compounds react by an exchange of ions to form two new compounds are called double displacement reactions. In double replacement reactions, the positive ions exchange negative ion partners. A double replacement reaction is represented by the general equation.
\[AB+CD\to AC+BD\]
A decomposition reaction is a reaction in which a compound breaks down into two or more simpler substances. The general form of a decomposition reaction is:
\[AB\to A+B\]

Hence, the correct option is the D option.

Note: A displacement reaction is the one wherein the atom or a set of atoms is displaced by another atom in a molecule. For instance, when iron is added to a copper sulphate solution, it displaces the copper metal.
\[~A+B-C\to A-C+B\]
The above equation exists when A is more reactive than B.
Most decomposition reactions require an input of energy in the form of heat, light, or electricity.