Question

Refer to the plot of temperature versus time showing the changes in the state of ice on heating (not to scale).

Which of the following is correct ?

• A. AB represents ice and water are not in the thermal equilibrium.
• B. At B water starts boiling.
• C. At C all the water gets converted into stem.
• D. CD represents water and steam in equilibrium at boiling point.

Answer 1

Answer: (D)

CD represents water and steam in equilibrium at boiling point.

Answer 2

In the given graph, AB represent no change in temperature with time. It means ice and water are in thermal equilibrium. BC shows the change in temperature with time. CD represent a constant temperature $(100{^\circ}C)$ with time. It means, water and steam are in thermal equailibrium at boiling point.