Question

The change of state of water from one form to another is:
(A) Chemical change
(B) Irreversible change
(C) Reversible change
(D) State variation

Answer 1

Hint: To answer this question, you must recall the different types of changes that occur in nature. We know that changes occurring in matter can be of two types either physical changes or chemical changes. Physical changes are generally reversible while the chemical changes are irreversible in nature.

Complete step by step solution
First we discuss the various types of changes in matter. A change can be either physical or chemical.
The change of state of water is a physical change. There are no changes occurring in the composition of the molecules of the water. If ice converts to water and water converts to vapors, we can easily convert them back to the original states. Thus, we can say that the change occurring is a reversible change.
The correct answer is C.

Note
A physical change is that change in which the state of the matter, or the shape, size, etc. of a substance are varied. There are no changes occurring in the composition of the substance and the new substance which is formed has exactly the same properties as the old substance. Physical changes are thus reversible and the old substance can be obtained back easily.
On the other hand, chemical changes are the changes in which a change in the chemical composition of the substance occurs. As a result of the rearrangement of the particles (atoms, molecules or ions), a new substance is obtained after a chemical change which has an entirely different composition and thus different properties than the original substance. Chemical changes are irreversible and we cannot obtain the original substance back by simple methods.