Question

The melting point of ice and freezing point of water have …………… numerical values.
A. Same
B. Different
C. Can’t say
B. None of the above

Answer 1

Hint: In calorimetric there are many phenomena and among them two are needed to know here for clarification of this question that is related to state of matter or water what how its temperature, heat exchanged and state are connected.

Complete step-by-step answer:

Melting point of water- The melting point of water may be defined as the temperature at which the water changes its state from solid to liquid. The temperature at which this process occurs is 0 degree Celsius.

Freezing point of water- The freezing point of water may be defined as the temperature at which the water changes its state from liquid to solid. The temperature at which this process occurs is 0 degree Celsius.

Case 1- Whenever a body exchanges heat then its temperature either changes or remains constant. When the temperature of a body changes then the state of the body must remain the same.

Case 2- And when the body exchanges heat and its temperature remains the same then its state changes.

Same as any other matter, water also behaves in the same way. When its state changes from ice to water or water to ice its temperature remains fixed.
Hence the correct option is A.

Note: Thus the melting point and freezing point of water is same i.e. Zero degree Celsius or 273 kelvin. Heating a solid beyond its melting point is difficult, if not impossible, as the heat that enters the solid at its melting point is used to turn the solid into a liquid.