Answer: Option (3) is the correct answer.
Explanation:
A single replacement reaction is defined as the reaction where an element on reaction with a compound tends to displace another element in that compound.
For example, [tex]Zn(s) + H_{2}SO4(aq) \rightarrow ZnSO_{4}(aq) + H_{2}(g)[/tex] is a single replacement reaction.
Also, when number of atoms on reactant side equal to the number of atoms on product side then it is known as a balanced chemical reaction.
In a synthesis reaction, two elements combine together and result in the formation of a single product.
For example, [tex]A + B \rightarrow AB[/tex]
In a decomposition reaction, a compound splits or breaks into two atoms.
For example, [tex]AB \rightarrow A + B[/tex]
Thus, we can conclude that [tex]Zn(s) + H_{2}SO4(aq) \rightarrow ZnSO_{4}(aq) + H_{2}(g)[/tex] represents a balanced single replacement chemical reaction.
