Answer: Option (c) is the correct answer.
Explanation:
When there is recombination of atoms to form newer molecules then it is called a chemical change.
For example, [tex]A-B + C-D \rightarrow A-C + B-D[/tex] is a chemical change.
Tarnishing of a silver coin is a chemical change which occurs when silver reacts with moisture in the air as a result silver loses its luster.
Thus, we can conclude that out of the given options tarnishing of a silver coin is an example of recombination of atoms to form newer molecules.
