Question

Select the correct option given below:
Refer to the plot of temperature versus time showing the change in the state of ice on heating (not to scale).
Which of the following is correct?

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

Answer 1

The correct option is D CD represent water and stem in equilibrium at boiling point.

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 $\left({100}^{o}C\right)$ with time .It means ,water and steam are in thermal equilibrium at boiling point.