over a wide range of temperature
over a narrow range of temperature
at a lower temperature than the impure one
at the same temperature as the impure one
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A pure solid usually melts over a narrow range of temperature. This is because a pure substance has a specific melting point, unlike impure substances which melt over a range of temperatures due to the presence of impurities.
The melting point is a physical property of a solid and can be used to help identify a substance. In practice, a solid usually melts over a range of temperatures rather than at one specific temperature. For this reason it is more useful to speak of a melting point range.
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