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    The Solid State
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    Why do solids have a definite volume?
    A solid have a definite volume because the inter molecular distance  between its molecules are fixed.
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    Why is glass considred a super-cooled liquid?
    Glass is amorphous solids and  have a tendency to flow, though very slowly. Therefore, these are called pseudo solids or super cooled liquids .
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    Classify the following as amorphous or crystalline solids: Polyurethane, naphthalene, benzoic acid, teflon, potassium nitrate, cellophane, polyvinyl chloride, fibre glass, copper.

    Amorphous solids: Polyurethane, teflon, cellophane, polyvinyal chloride, fibre glass.
    Crystalline solids: naphthlene, benzoic acid, potassium nitrate, copper.
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    Refractive index of a solid is observed to have the same value along all directions. Comment on the nature of this solid. Would it show clevage property?
    Refractive index of a solid which have the same value along all directions are isotropic in nature. It would not show cleavage property.
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    Why are solids rigid?
    Solids are rigid because the internuclear distance between the  molecules of a solid are very less and closely packed and their positions are fixed due to the strong forces of attraction between them.
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