How to know if a given solid is crystalline or amorphous by looking at its name like benzoic acid naphthalene balls

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Solution

Dear student,

The classification of solid as crystalline and amorphous can not be determined by looking at the solid as it can identified as crystalline and amorphous by there melting point.
crystalline solid have sharp melting point whereas amorphous solids soften over a range of temperature.

Benzoic acid and naphthalene balls are crystalline solid.

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