1.

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

Answer»

Solution :The above MENTIONED SUBSTANCES are classified as under :
Crystalline SOLIDS `""` Amorphous solids
BENZOIC acid`""`Polyurethane
Potassium nitrate`""` Naphthalene
Copper`""` Teflon
Cellophane
Polyvinyl chloride
FIBRE glass


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