Answer: Option (c) is the correct answer.
Explanation:
A change in which there occurs a difference in chemical composition of a substance then it is known as chemical change.
For example, precipitation, reactivity, toxicity etc are chemical change.
In a chemical change, there will always be formation of a new compound or substance will take place.
For example, [tex]2Na + Cl_{2} \rightarrow 2NaCl[/tex] is a chemical change.
Thus, we can conclude that if a chemical change has taken place then a completely new substance is formed.
