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When a solid melts, there is
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Correct option is A
Melting, or fusion, is a physical process that results in the phase transition of a substance from a solid to a liquid. This occurs when the internal energy of the solid increases, typically by the application of heat or pressure, which increases the substance's temperature to the melting point. It is an endothermic reaction and heat is absorbed. Thus, there will be an increase in enthalpy.
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