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A solid substance has a molar volume which is smaller than that of its liquid phase. Which of the following statements regarding the solid-liquid phase transition is/are true?

(More than one answer may be selected).

A The slope of the solid-liquid phase boundary line is directly proportional to the temperature at which the phases are in equilibrium.

B The magnitude of the slope of the solid-liquid phase-boundary line will be much greater than that of the liquid-vapour phase boundary line.

C The fusion (melting) process is always exothermic.

D The slope of the solid-liquid phase boundary is positive.

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