Answer: Option (C) is the correct answer.
Explanation:
A nuclear reaction is a reaction which brings change in the nucleus of an atom.
For example, [tex]^{2}_{1}H + ^{3}_{1}H \rightarrow ^{4}_{2}He + ^{1}_{0}n[/tex]
A chemical reaction is a reaction which results in the formation of new compounds which have different properties than their reactants.
Hence, in a nuclear reaction changes in an atom occurs whereas in a chemical reaction changes in a compound or molecule occurs.
Thus, we can conclude that a major difference between a chemical reaction and a nuclear reaction is that only nuclear reactions can change the identity of the atom.
