Short Answer Type

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Explain the following with suitable examples:
Antifluorite structure 


Antifluorite structure: 
The antifluorite structure is the opposite arrangment with anion in FCC array with coordination number 8 and cation in the tetrahedral holes with coordination number 4. example of the antifluorite structure are K2O, LiO, Na2O and K2S.
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Fill In the Blanks

A liquid which is permanently supercooled is frequently called a _____
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The smallest portion of a crystal which has the structure characteristic of space lattice is called the__________.
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Short Answer Type

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.
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Give reasons for the following:
Molecular solids are generally soft and easily compressible.
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Explain the following with suitable examples:
Piezoelectric effect (or pressure electricity)
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Explain the following with suitable examples:
Ferrimagnetism
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Give reasons for the following:
Ionic solids, inspite of being made up of ions, do not conduct electricity.
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Give reasons for the following:
Covalent crystals like diamond and silicon carbide are quite hard and difficult to break.
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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.
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