Question

Identify the reversible change/changes among the following:
Change 1 - Boiling of water
Change 2 - Burning of wood
Change 3 - Stretching of a rubber band

• A. Only 3 is a reversible change.
• B. Only 1 is a reversible change.
• C. Both 1 and 2 are reversible changes.
• D. Both 1 and 3 are reversible changes.

Answer 1

The correct option is D Both 1 and 3 are reversible changes.

Reversible changes are the changes that can be reversed.

Boiling of water gives steam which can be further condensed to water. Hence, boiling of water is a reversible change.

If we stretch a rubber band by applying force, its length increases. On removing the force, it reduces to its original length. Hence, the stretching of a rubber band is a reversible change.

Irreversible changes are the changes that cannot be reversed.

On burning wood, we get ash and smoke. We cannot change ash and smoke back to wood. Hence, the burning of wood is an irreversible change.