Question

Which of the following have melting point, boiling point and freezing point as their respective properties?
${\text{A}}{\text{.}}$ Solid, gas and liquid
${\text{B}}{\text{.}}$ Solid, liquid and liquid
${\text{C}}{\text{.}}$ Solid, liquid and gas
${\text{D}}{\text{.}}$ Liquid, solid and gas

Answer 1

Hint: Here, we will proceed by defining the melting point, boiling point and freezing point respectively for any substance. Finally, we will write down the respective physical states (or phases) corresponding to each of these three points.

Complete step-by-step answer:
Generally, the melting point is known as the point at which materials change its physical state from a solid to a liquid. At atmospheric pressure, the temperature at which solid changes its state to liquid is called the melting point of that material. This is the point at which equilibrium occurs in both the liquid and solid phases. The substance's melting point often varies with heat, and is usually defined at normal pressure.
The word freezing point is used to describe the temperature at which a liquid is turned into a solid and hence can be interpreted as the opposite of the word melting point. Substances, however, can be cooled under their freezing points without forming a solid. Liquids such as these are known as super cooled liquids.
A liquid 's boiling point is the temperature at which the liquid's vapour pressure is equal to that of the liquid's atmosphere pressure. The liquid is converted into a vapour at this temperature.
The boiling point of the liquid is dependent upon the surrounding pressure. Under normal atmospheric pressure, where the liquid is under high pressure, it has a higher boiling point than the boiling level. With a given pressure the boiling point of various liquids is different.
The temperature at which the pressure of liquid vapour is equal to the pressure of the atmosphere is called the boiling point. The boiling point is defined as the temperature at which the saturated vapour pressure of a liquid equals its surrounding atmospheric pressure.
For any substance the boiling point is the temperature point at which the material in the liquid phase converts into the gas phase. For water this happens at 100 degrees centigrade. In reality, the Celsius scale was produced based on the melting point of ice or water and the boiling point of liquid water or vapour. Each material bears a boiling point of its own.
Pure and crystalline solids have a melting point as their characteristic property, the temperature at which the solid melts to become a liquid. When a liquid is heated it eventually reaches a temperature at which the vapour pressure is sufficiently large that bubbles form within the liquid 's body. The temperature is known as the boiling point. Liquids have a proper temperature as their characteristic property at which they become solids, known as their freezing point.
Therefore, melting point, boiling point and freezing point are properties of solid, liquid and liquid respectively.

Hence, option B is correct.

Note- When all the particles in the liquid phase have been converted into the gas phase, the temperature starts to rise again, as long as the surrounding system still receives heat. When the temperature continues to go up, so does the kinetic energy of the particle. A characteristic number is the melting temperature of the crystalline solids and is used to classify pure compounds and elements. Many amorphous solids and mixtures melt over a range of temperatures.