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Give reasons for the following:
The energy required to vapourise one mole of copper is smaller than that of energy required to vapourise one mole of diamond.


The bonding have great influence on the any substance. Copper is a metallic solid having metallic bonds while diamond is a covalent solid having covalent bonds. Metallic bonds are weaker than covalent bonds thus lesser amount of energy is required to break metallic bonds than covalent bonds.
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Give reasons for the following:
Molecular solids are generally soft and easily compressible.

Explain the following with suitable examples:
Antifluorite structure 

Give reasons for the following:
All metals have metallic bonds but some metals are soft and having low melting points and some are hard and having high melting points.

Explain the following with suitable examples:
Piezoelectric effect (or pressure electricity)

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