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 ?

AB represents ice and water are not in the thermal equibrium.

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At b water starts boiling.

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At C all the water gets converted into steam.

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CD represents water and steam in equilibrium at boiling point.

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Solution

The correct options are
A AB represents ice and water are not in the thermal equibrium.
C CD represents water and steam in equilibrium at boiling point.
In the given graph, AB represents no change in temperature with time. It means ice and water are in thermal equilibrium. BC shows the change in temperature with time. CD represents a constant temperature $(100)$ with time. It means, water and steam are in thermal equilibrium at boiling point.

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