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Fe2O3 + 2Al → Al2O3 + 2Fe
The above reaction is an example of a
(a) combination reaction
(b) double displacement reaction
(c) decomposition reaction
(d) displacement reaction
Correct Answer: (d) Displacement reaction
Explanation: A displacement reaction is one wherein the atom or a set of atoms is displaced by another atom in a molecule. The general equation for displacement reaction is,
A + B-C → A-C + B.
[Extra information: 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).
It may be presented in the following form A + B --> AB.
eg: H2 + Cl2 --> 2HCl
REACTANT 1 + REACTANT 2 -----> PRODUCT
Decomposition reactions: The reactions in which a compound splits up into two or more simpler substances when energy is provided to it is known as decomposition reactions.
Example: When calcium carbonate is heated, it decomposes to give calcium oxide and carbon dioxide.
$CaCO_{3}\xrightarrow{Heat} CaO + CO_{2}$
Decomposition reactions are called the opposite of combination reactions because, in a combination reaction, two or more substances combine with the release of energy to form a single substance.
Example: Carbon combines with oxygen to produce carbon dioxide and energy is released in this process.
$C\ ( s) \ +\ O_{2} \ ( g) \ \rightarrow \ CO_{2} \ +\ Heat$]
Updated on: 14-Mar-2023
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