Question

Fig. shows the variation in temperature with time when some wax cools from the liquid phase to the solid phase. What does the part QS of the curve represent ?
181340_f7052b647f1d4337943584cdec07fb00.png

A
melting
B
freezing
C
boiling
D
insufficient data
Solution
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Freezing.
In part PQ, the state is liquid and temperature is decreasing, In part QS there is change of state from liquid to solid, i.e., this stage is freezing, without change in temperature. In part ST, state is solid and temperature is decreasing with time.

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