Question

Which change can be easily reversed?
A.Chemical change
B.Physical change
C.Both physical and chemical change
D.Neither physical nor chemical change

Answer 1

To solve this question, we must first discuss the types of changes that are involved in the changes given in the options. Then we can deduct which change suits best to reverse.

Complete Step-by-Step Answer:
Before we move forward with the solution of the given question, let us first understand some important basic concepts.
Chemical changes can be understood as the changes that take place at a molecular level. When two or more substances are made to react with each other, depending on the reactivity of the involved substances, at the molecular level there is a breaking and making of chemical bonds. This results in formation of newly formed chemical compounds. Now, these compounds cannot be converted back to its reacting compounds using simple procedures. Usually, a lot of energy is required to reverse a chemical change, and many times, it is not even possible to get the exact quantity of the parent compounds which were used initially. One example is the ripening of a fruit. The chemical changes in the molecule of the fruit tend to make it change from a raw state to a ripe state. And it is next to impossible to obtain the raw fruit back.
On the other hand, physical changes can be understood as the changes that place only with respect to the physical properties of the given substance. Physical changes can be explained by the freezing of water. When we reduce the temperature of the water to its freezing point, the state of water changes from liquid state to solid state. But if the temperature of this solid water or ice is increased again, then we obtain the same amount of water we had initially used. Hence, we can say that physical changes are reversible.

Hence, Option B is the correct option

Note: Reversible change is a change that can be undone or reversed. If you can get back the substances you started the reaction with, that's a reversible reaction. Or else, the reaction can be considered as an irreversible change.