Question

The temperature at which a solid melts to become a liquid at the atmospheric pressure is called its
A) Melting point
B) Boiling point
C) Freezing point
D) Sublimation point

Answer 1

Hint: It is a physical property for the indication of purity and identification of an element. It tells about the intermolecular force of attraction between the particles in the solid.

Complete answer:
So here we should specify that temperature at which the solid melts to become a liquid at the atmospheric pressure. It is very much evident that the question itself contains the answer.
The phenomenon in which the solid state changes to a liquid state is through the process called melting and that temperature at which the liquid and solid state is in equilibrium is called the melting point. When the temperature is raised even in a very minute magnitude, the solid melts and is said to be in liquid state.
At the melting point, technically the solid and liquid phase co-exists.
Now let’s take a day to day life scenario as the example,
Consider the melting process of ice. Here the solid ice contains many particles inside them which are continuously vibrating in their positions. When heat is given, it absorbs and it melts.
The reason for melting is, all the particles in the solid ice possess a kinetic energy. When we give a temperature then the kinetic energy of the particles is increasing and it is vibrating in an increased rate along with a attracting the neighboring particles and when the temperature reaches to 273 K or say ${{0}^{\circ }}C$, the solid ice melts down to liquid water. And that temperature is called the melting point or point of fusion.

So the correct answer for the question is option (A).

Note: Melting point is one of the most characteristic features to identify the elements. All the elements have their own melting point.
Melting point is also a source for the check for purity as if any impurities are present in the substance then there may be an increase or decrease in the temperature of the point of fusion or called a melting point.