Question

When the supercooled liquid starts freezing, the temperature
A. Falls to freezing point
B. Rises to freezing point
C. Fluctuates
D. Remains constant

Answer 1

Hint: We know that freezing point is the temperature at which a liquid changes into solid, at normal atmospheric pressure. There are several factors that affect the freezing point such as the type of molecules, intermolecular forces of attraction. We should know that the change in pressure can increase or decrease the freezing point of a substance.

Complete step by step answer:
As per the question we have to find out what happens when the supercooled liquid starts freezing.
Supercooling is the process of chilling the liquid beyond its freezing point without turning it into a solid form.
A supercooled liquid rises in temperature as the process of freezing begins, because in the process of change of state from solid to liquid state the material gives out its latent heat. This latent heat increases the temperature of the substance.
We can say that this process is also an exothermic process. It releases a significant amount of energy, which causes the surroundings to be higher in temperature.

Hence when the supercooled liquid starts freezing, the temperature (B) Rises to freezing point.

Note:
We should note that exothermic is a type of process which releases energy in the form of heat or light. Its overall standard enthalpy change is $\Delta H$, which is negative. The freezing point of water is ${0^ \circ }$Celsius, and below that temperature, the water exists in the form of ice.