3.Classify the following as amorphous or crystalline solids: Polyurethane, naphthalene, benzoic acid, teflon, potassium nitrate, cellophane, polyvinyl chloride, fibre glass, copper.
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4.Why is glass considred a super-cooled liquid?
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5.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?
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6.Classify the following solids in different categories based on the nature of intermolecular forces operating in them: Potassium sulphate, tin, benzene, urea, ammonia, water, zinc sulphate, graphite, rubidium, argon, silicon carbide.
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