Question

When ice melts, its temperature
A. remains constant
B. increases
C. decreases
D. cannot say

Answer 1

Hint: When the state of a substance is changing then the all heat that is being supplied to it is being used in changing the state from one to another. There is no change in the temperature of the substance when the state of the substance is changing.

Complete step by step answer:
The melting point of a substance can be defined as the temperature at which the substance changes its state from solid to liquid. All the heat that is supplied to the substance at its melting point is used in changing the state of the substance and there is no change in the temperature of the substance at the melting point.
The ice is a solid form of water. The temperature at which it melts is known as the melting point or the freezing point of water. The temperature of ice remains constant when it starts melting at its melting point. All the heat that is being supplied for the melting ice is used to change the state from solid to liquid while there is no change in the temperature of the ice.

So, the correct answer is “Option A”.

Additional Information: The same thing happens at the boiling point of water when water changes state from liquid to gaseous state.
The amount of heat energy that is required to convert given amount of ice to water at the melting point of ice is known as the latent heat of fusion of ice while the amount of heat energy that is required to convert given amount of water to steam at the boiling point of water is known as the latent heat of vaporization of water.

Note: All the change in state takes place at the same temperature. This means that at the melting point, we shall have a mixture of water in liquid form as well as ice in solid form while the temperature remains the same throughout until all the ice is converted into water and the temperature starts rising after that point.