Refer to the plot of temperature versus time (figure) showing the changes in the state if ice on heating (not to scale). Which of the following is correct ?
.

Options

A. The region AB represents ice and water in thermal equilibrium.
B. At B water start boiling.
C. As C all the water gets converted into steam.
D. C to D represents water and steam in equilibrium at bloiling point.

Answer

A, D

Explanation

In the given graph, the region AB represents no change in temperature with. It means ice and water are in thermal equilibrium. The region BC shows the change in temperature with time. The region CD represents a constant temperature `(100^(@)C)` with time. It means, water and steam are in thermal equilibirum at boling point.