Question

Fig. shows the variation in temperature with time when some wax cools from the liquid phase to the solid phase. In which part of the curve, the wax is in liquid phase ?
181333_bba07b55536a40da8e4ffaa4aadb9220.png

A
PQ
B
QS
C
ST
D
None of the above
Solution
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PQ.
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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