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Chemistry question

Question :Classify following as amorphous or crystalline solids: Polyurethane, naphthalene, benzoic acid, Teflon, potassium nitrate, cellophane, polyvinyl chloride, fibre glass, copper.

 Answer: Amorphous solids : Polyurethane, Teflon, cellophane, polyvinyl chloride, fibre glass .
Crystalline solids   :  Naphthalene, benzoic acid, potassium nitrate,copper .

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