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Classification of solids
Concepts tested here
- Properties of metals
All Questions
2010 AIPMT-PRE 1 question
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Which one of the following bonds produces a solid that reflects light in the visible region and whose electrical conductivity decreases with temperature and has high melting point?A solid that reflects visible light is lustrous; this is caused by free electrons, which is a property of metals.
In metals the conductivity decreases as temperature rises, because the increased lattice vibrations scatter the free electrons more (resistivity increases).
Metals generally also have high melting points because of strong metallic bonding.
Covalent and ionic solids are insulators or semiconductors whose conductivity increases with temperature, and van der Waals solids have low melting points.
Hence the bonding is metallic.