Question

In an experiement of conversion of ice into water and water into vapours, observation were recorded and graph was plotted. It can be concluded that

• A. at 0°C, both water and ice coexist.
• B. during melting and boiling, the temperature doesn’t rise.
• C. the process of boiling occurs at a higher temperature than the process of melting.
• D. all of the above.

Answer 1

The correct option is D all of the above.

The melting point for water is 0°C. Hence at this temperature, the liquid water starts getting converted into ice and both coexist.
During melting and boiling, in spite of providing a consistent heat supply, the temperature of the system remains constant until the whole process is completed. This is because of the latent heat of fusion and the latent heat of vaporization.
The gaseous state has more energy than the liquid state. Hence more heat is required for boiling than melting.