Differentiate between physical and chemical changes.

A chemical alteration is fundamentally irreversible and permanent.
Physical changes are transient and reversible by their very nature. Only physical characteristics, such as shape, size, etc., are affected.

There are so many changes occurring around us simultaneously. They can be classified into physical and chemical changes based on properties that are changing. In a physical change, a reorganization of atoms occurs while chemical changes lead to the formation of new substances.

Chemical changes are irreversible. Examples include iron rusting, coal burning, etc.

Physical changes are reversible in nature. Examples include melting of ice, heating pan, etc.

To develop higher level notions, it is crucial to comprehend these fundamental principles.
Many pupils become perplexed in this situation, therefore attempt to learn more about it by doing research rather than memorising definitions.

Hence, the correct answer is option D.