Over a period of time, a thermometer is used to record the cooling of a confined pure substance. During which interval on the cooling graph, the system undergoing a change of state from a liquid to a solid?

A

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B

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C

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D

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E

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Solution

The correct option is B $D$
During interval $D$ on the cooling graph, the system undergoing a change of state from a liquid to a solid.
During interval $B$ on the cooling graph, the system undergoing a change of state from a gas to a liquid.
During change of state, the temperature remains constant. This is represented by straight line parallel to time axis.

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