Discussion
Which one of the following substances does not have a melting point
Answer: D
Glass has no melting point.
It is an amorphous solid - a supercooled liquid - with no long-range order and therefore no fixed temperature at which the lattice collapses. It simply softens gradually over a range. Crystalline solids such as sodium chloride, and the elements bromine and mercury, all have sharp melting points.
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