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 ?
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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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Based on the statements given here choose the correct answer. (1) Boiling point of a liquid increases with increase in temperature. (2) The volume of liquids increases on boiling and the vaporisation curve shows the variation of the boiling point of a liquid with pressure and expands the equilibrium state between liquid and vapour phase.
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