Question

What is an example of single displacement reaction?
A) \[2{H_2}{O_2} \to 2{H_2}O + {O_2}\]
B) \[N{a_2}S{O_4} + BaC{l_2} \to BaS{O_4} + 2NaCl\]
C) \[Zn{\text{ }} + {\text{ }}2HCl \to ZnC{l_2} + {H_2}\]
D) \[2{H_2} + {O_2} \to 2{H_2}O\]

Answer 1

Hint: We must know that by looking at the chemical reaction it is easy to find out what type of reaction it is following. Option A and C are easy to identify which type of reaction it is following.

Complete step by step answer:
We will proceed option wise to get this question solved.
Option A) this is an incorrect option as \[2{H_2}{O_2} \to 2{H_2}O + {O_2}\] this reaction is a decomposition reaction.
Decomposition reactions are the one in which a single compound breaks itself into smaller units or simpler substances.
\[XY \to X + Y\]
Option B) this is an incorrect option as \[N{a_2}S{O_4} + BaC{l_2} \to BaS{O_4} + 2NaCl\] this reaction is a type of double displacement reaction as the ions of the reactants get exchanged in the formed products.
Double Decomposition reactions are the one in which the constituent charges of two reactants interchange itself to form new compounds.
\[XY + ZA \to Z + AY\]
Option C) this is a correct option as in this reaction displacement is taking place and also it is a single displacement which is asked in the question.
Displacement reactions are the ones in which an atom or a group of atoms is displaced by another atom in a molecule.
\[X + YZ \to XY + Z\]
\[Zn{\text{ }} + {\text{ }}2HCl \to ZnC{l_2} + {H_2}\], this reaction follows this type of reaction as \[Zn\] metal is displacing \[{H_2}\] from \[HCl\]. So it is a single displacement.
Option D) this is an incorrect option as \[2{H_2} + {O_2} \to 2{H_2}O\] this reaction comes under a class of combination reactions.
The reaction in which two or more elements/compounds react to form a single compound can be known as combination reaction.
\[X + Y \to XY\]

Note: We have to remember that double displacement reactions require two reactants having varying charge and as a product give a new compound by interchanging the charges.
As we know that displacement reactions are the one in which a group of atoms gets displaced by other atoms.